Alfermann, D., & Stambulova, N. (2007). Career transitions and career termination. In G. Tenenbaum and R.C. Eklund (Eds.), Handbook of sport psychology, 3rd ed. (pp. 712–736). New York, NY: Wiley.

Allen, S., & Hopkins, W. (2015). Age of peak competitive performance of elite athletes: A systematic review. Sports Medicine, 45(10), 1431–1441.

Anderson, D. I., & Mayo, A. M. (2015). A skill acquisition perspective on early specialization in sport. Kinesiology Review, 4(3), 230–247. doi: http://dx.doi.org/10.1123/kr.2015-0026

Aspen Institute. (2015). The Aspen Institute Project Play. Washington, D.C.: The Aspen Institute. Retrieved from https://www.aspenprojectplay.org/#

Atkinson, G., & Nevill, A.M. (1998). Statistical methods for assessing measurement error (reliability) in variables relevant to sports medicine. Sports Medicine (Auckland, N.Z.), 26, 217–238.

Bahrick, H.P., Hall, L.K., & Berger, S.A. (1996). Accuracy and distortion in memory for high school grades. Psychological Science, 7, 265–71.

Baker, J. (2003). Early specialization in youth sport: A requirement for adult expertise? High Ability Studies, 14, 85–94.

Baker, J., Cobley, S., & Fraser-Thomas, J. (2009). What do we know about early sport specialization? Not much! High Ability Studies, 20(1), 77–89.

Baker, J., Côté, J., & Abernethy, B. (2003a). Learning from the experts: Practice activities of expert decision makers in sport. Research Quarterly for Exercise and Sport, 74(3), 342- 347.

Baker, J., Côté, J., & Abernethy, B. (2003b). Sport-specific practice and the development of expert decision-making in team ball sports. Journal of Applied Sport Psychology, 15, 12- 25.

Baker, J., Côté, J., & Deakin, J. (2006) Patterns of early involvement in expert and nonexpert masters triathletes. Research Quarterly for Exercise and Sport, 77(3), 401–407.

Baker, J., & Horton, S. (2004). A review of primary and secondary influences on sport expertise. High Ability Studies, 15, 211–228. doi: 10.1080/ 1359813042000314781

Baker, J., Horton, S., Robertson-Wilson, J., & Wall, M. (2003). Nurturing sport expertise: Factors influencing the development of elite athlete. Journal of Sports Science and Medicine, 2(1), 1–9.

Baker, J., Mosher, A., & Fraser-Thomas, J. (2020). Is it too early to condemn early sport specialisation?. British Journal of Sports Medicine.

Baker, J., Wattie, N., & Schorer, J. (2015). Defining expertise: A taxonomy for researchers in skill acquisition and expertise. In J. Baker and D. Farrow (Eds.), Routledge Handbook of Sport Expertise (pp. 145–155). London: Routledge.

Baker, J., & Young, B. (2014). 20 years later: Deliberate practice and the development of expertise in sport. International Review of Sport and Exercise Psychology, 7, 135–157. doi: http://dx.doi.org/10.1080/1750984X.2014.896024

Balish, S., & Côté, J. (2014). The influence of community on athletic development: an integrated case study. Qualitative Research in Sport, Exercise and Health, 6(1), 98–120. Doi: http://dx.doi.org/10.1080/2159676X.2013.766815

Balyi, I., & Hamilton, A. (2004). Long-term athlete development: Trainability in childhood and adolescence. Windows of opportunity, optimal trainability. Victoria, BC: National Coaching Institute British Columbia & Advanced Training and Performance.

Barth, M., Emrich, E., & Güllich, A. (2019). A machine learning approach to “revisit” specialization and sampling in institutionalized practice. SAGE Open, 9(2), 1 – 18. Doi: https://doi.org/10.1177/2158244019840554

Barreiros, A., Cote, J., & Fonseca, A. M. (2012). From early to adult sport success: Analysing athletes’ progression in national squads. European Journal of Sport Science, 1-5.

Baumgartner, T. A., Jackson, A. S., Mahar, M. T., & Rowe, D. A. (2007). Measurement for evaluation in physical education and exercise science (8th ed.). New York, NY: McGraw-Hill.

Beauford, J. E., Nagashima, Y., & Wu, M. (2009). Using Translated Instruments In Research. Journal of College Teaching & Learning, 6(5), 77-82.

Bell, D. R., Post, E. G., Trigsted, S. M., Hetzel, S., McGuine, T. A., & Brooks, M. A. (2016). Prevalence of sport specialization in high school athletics: a 1-year observational study. The American Journal of Sports Medicine, 44(6), 1469– 1474. https://doi.org/10.1177/0363546516629943

Bergeron, M. F., Mountjoy, M., Armstrong, N., Chia, M., Côté, J., Emery, C. A., … Engebretsen, L. (2015). International Olympic committee consensus statement on youth athletic development. British Journal of Sports Medicine, 49, 843– 851. doi: 10.1136/bjsports- 2015- 094962

Berry, J., Abernethy, B., & Côté, J. (2008). The contribution of structured activity and deliberate play to the development of expert perceptual and decision-making skill. Journal of Sport & Exercise Psychology, 30, 685–708.

Bloom, B. S. (Ed.). (1985). Developing Talent in Young People. New York: Ballantine Books.

Boccia, G., Moisè, P., Franceschi, A., Trova, F., Panero, D., La Torre, A., ...Cardinale, M. (2017). Career performance trajectories in track and field jumping events from youth to senior success: The importance of learning and development. PLoS ONE, 12(1), e0170744. doi:10.1371/journal. pone.0170744

Brewer, C. J., & Jones, R. L. (2002). A five-stage process for establishing contextually valid systematic observation instruments: The case of rugby union. The Sport Psychologist, 16(2), 138–159. doi: 10.1177/1356336X11430653

Bridge, M. W., & Toms, M. R. (2013). The specialising or sampling debate: a retrospective analysis of adolescent sports participation in the UK. Journal of Sports Science, 31(1), 87-96. doi: 10.1080/02640414.2012.721560

Bruner, M. W., Erickson, K., Wilson, B., & Côté, J. (2010). An appraisal of athlete development models through citation network analysis. Psychology of Sport and Exercise, 11(2), 133-139. https://doi.org/10.1016/j.psychsport.2009.05.008

Buckley, P. S., Bishop, M., Kane, P., Ciccotti, M. C., Selverian, S., Exume, D., ... & Ciccotti, M. G. (2017). Early single-sport specialization: a survey of 3090 high school, collegiate, and professional athletes. Orthopaedic journal of sports medicine, 5(7). https://doi.org/10.1177/2325967117703944

Bullock, N., Gulbin, J.P., Martin, D.T., Ross, A., Holland, T., & Marino, F.E. (2009). Talent identification and deliberate programming in skeleton: Ice novice to Winter Olympian in 14 months. Journal of sports sciences, 27(4), 397-404.

Carlson, R. (1988). The socialization of elite tennis players in Sweden: An analysis of the players' backgrounds and development. Sociology of Sport Journal, 5, 241- 256.

Chemero, A. (2003). An outline of a theory of affordances. Ecological Psychology, 15(2), 181–195.

Cohen, J. (1960). A coefficient of agreement for nominal scales. Educational and Psychological Measurement, 20, 37–46.

Cohen, J. (1988). Statistical power analysis for the behavioral sciences (2nd ed.). Hillsdale, NJ: Lawrence Erlbaum Associates, Publishers.

Cohen, J. (1992). A power primer. Psychological Bulletin, 112(1), 115–159. doi:10.1037/0033-2909.112.1.155

Collins, R., Collins, D., MacNamara, Á., & Jones, M. I. (2014). Change of plans: an evaluation of the effectiveness and underlying mechanisms of successful talent transfer. Journal of Sports Sciences, 32(17), 1621-1630.

Cope, E., Partington, M., & Harvey, S. (2017). A review of the use of a systematic observation method in coaching research between 1997 and 2016. Journal of Sports Sciences, 35(20), 2042–2050. doi: 10.1080/02640414.2016.1252463

Corso, M. (2018). Developmental changes in the youth athlete: Implications for movement, skills acquisition, performance and injuries. Journal of the Canadian Chiropractic Association, 62(3), 150-160.

Côté, J. (1999). The influence of the family in the development of talent in sport. Sport Psychology, 13, 395–417. doi: 10.1123/tsp.13.4.395

Côté, J., Baker, J., & Abernethy, B. (2003). From play to practice: A developmental framework for the acquisition of expertise in team sport. In J. L. Starkes & K. A. Ericsson (Eds.), Expert performance in sports: Advances in research on sport expertise (pp. 89–114). Champaign, IL: Human Kinetics.

Côté, J., Baker, J., & Abernethy, B. (2007). Practice and play in the development of sport expertise. In G. Tenenbaum & R. Eklund (Eds.), Handbook of sport psychology (3rd ed., pp. 184–202). Hoboken, NJ: John Wiley & Sons, Inc.

Côté, J., Erickson, K., & Abernethy, B. (2013). Play and practice during childhood. In J. Côté & R. Lidor (Eds.), Conditions of children’s talent development in sport (pp. 9–20). Morgantown: FIT.

Côté, J., Ericsson, K. A., & Law, M. P. (2005). Tracing the development of athletes using retrospective interview methods: A proposed interview and validation procedure for reported information. Journal of Applied Sport Psychology, 17(1), 1–19.

Côté, J., & Fraser-Thomas, J. (2007). The health and developmental benefits of youth sport participation. In P. Crocker (Ed.), Sport psychology: A Canadian perspective (pp. 266–294). Toronto, Ontario, Canada: Pearson.

Côté, J., & Hancock, D. J. (2016). Evidence-based policies for youth sport programmes. International Journal of Sport Policy and Politics. 8(1), 51 – 65. doi: 10.1080/19406940.2014.919338

Côté, J., & Hay, J. (2002). Children’s involvement in sport: A developmental perspective. In J. M. Silva & D. E. Stevens (Eds.), Psychological Foundations of Sport (pp. 484-502). Boston: Allyn and Bacon.

Côté, J., Lidor, R., & Hackfort, D. (2009). ISSP position stand: To sample or to specialize? Seven postulates about youth sport activities that lead to continued participation and elite performance. International Journal of Sport and Exercise Psychology, 7(1), 7-17. http://dx.doi.org/10.1080/1612197X.2009.9671889

Côté, J., Murphy-Mills, J., & Abernethy, B. (2012). The development of skill in sport. In N. Hodges & A. M. Williams (Eds.), Skill acquisition in sport: research, theory and practice (pp.269–286). New York, NY: Routledge.

Côté, J., & Vierimaa, M. (2014). The developmental model of sport participation: 15 years after its first conceptualization. Science & Sports, 29, S63-S69. Doi: 10.1016/j.scispo.2014.08.133

Coughlan, E. K., Williams, A. M., McRobert, A. P., & Ford, P. R. (2014). How experts practice: A novel test of deliberate practice theory. Journal of Experimental Psychology: Learning, Memory, and Cognition, 40(2), 449–458. Doi: 10.1037/a0034302 2014

Coutinho, P., Mesquita, I., Davids, K., Fonseca, A. M., & Côté, J. (2016). How structured and unstructured sport activities aid the development of expertise in volleyball players. Psychology of Sport and Exercise, 25, 51–59. http://dx.doi.org/10.1016/j.psychsport.2016.04.004

Coutinho, P., Mesquita, I., & Fonseca, A. M. (2016). Talent development in sport: a critical review of pathways to expert performance. International Journal of Sports Science & Coaching. 11(2), 279–293. doi: 10.1177/1747954116637499

Coutinho, P., Mesquita, I., Fonseca, A. M., & Côté, J. (2015). Expertise development in volleyball: The role of early sport activities and players’ age and height. Kinesiology, 47(2), 215–225.

Coutinho, P., Mesquita, I., Fonseca, A. M., & De Martin-Silva, L. (2014). Patterns of sport participation in Portuguese volleyball players according to expertise level and gender. International Journal of Sport Science & Coaching, 9(4), 579–592.

Cushion, C., Ford, P. R., & Williams, A. M., (2012). Coach behaviours and practice structures in youth soccer: Implications for talent development. Journal of Sports Sciences, 30(15), 1631–1641. doi: 10.1080/02640414.2012.721930

Cushion, C., Harvey, S., Muir, B., & Nelson, L. (2012). Developing the coach analysis and intervention system (CAIS): Establishing validity and reliability of a computerised systematic observation instrument. Journal of Sports Sciences, 30(2), 201–216. doi: 10.1080/02640414.2011.635310

Davids, K., Araújo, D., Vilar, L., Renshaw, I., & Pinder, R. (2013). An Ecological Dynamics Approach to Skill Acquisition: Implications for Development of Talent in Sport. Talent Development & Excellence, 5(1), 21–34.

De Bosscher, V., Bingham, J., Shibli, S., van Bottenburg, M., & De Knop, P. (2008). The global sporting arms race. An international comparative study on sports policy factors leading to international sporting success. Aachen: Meyer & Meyer.

De Bosscher, V., De Knop, P., van Bottenburg, M., & & Shibli, S. (2006). A conceptual framework for analysing sports policy factors leading to international sporting success. European Sport Management Quarterly, 6(2), 185–215.

De Bosscher, V., & De Rycke, J. (2017). Talent development programmes: A retrospective analysis of the age and support services for talented athletes in 15 nations. European Sport Management Quarterly, 17(5), 590-609. Doi: 10.1080/16184742.2017.1324503

De Bosscher, V., Shibli, S., Westerbeek, H., & van Bottenburg, M. (2015). Successful elite sport policies. An international comparison of the sports policy factors leading to international sporting success (SPLISS 2.0) in 15 nations. Aachen: Meyer & Meyer.

Deakin, J. M., & Cobley, S. (2003). A search for deliberate practice: An examination of the practice environments in figure skating and volleyball. In J. L. Starkes & K. A. Ericsson (Eds.), Expert performance in sports: Advances in research on sport expertise (pp. 115–135). Champaign, IL: Human Kinetics.

Deakin, J. M., Starkes, J. L., & Allard, F. (1998). The microstructure of practice in sport. Sport Canada Technical Report. Ottawa: Sport Canada.

Difiori, J. P., Benjamin, H. J., Brenner, J. S., Gregory, A., Jayanthi, N., Landry, G. L., & Luke, A. (2014). Overuse injuries and burnout in youth sports: a position statement from the American Medical Society for Sports Medicine. British Journal of Sports Medicine, 48, 287–288. doi: 10.1136/bjsports-2013-093299

DiSanti, J. S., & Erickson, K. (2019). Youth sport specialization: A multidisciplinary scoping systematic review. Journal of Sports Sciences, 37(18), 2094–2105. Doi: 10.1080/02640414.2019.1621476

Donkers, J. L., Martin, L. J., & Evans, M. B. (2018). Psychological collectivism in youth athletes on individual sport teams. International Journal of Sport and Exercise Psychology, 16(3), 285-299. doi: 10.1080/1612197X.2016.1218529

Drake, D., & Breslin, G. (2017). Developmental activities and the acquisition of perceptual-cognitive expertise in international field hockey players. International Journal of Sports Science & Coaching, 0(0), 1-7.

Emrich, E., Fröhlich, M., Klein, M., & Pitsch, W. (2009). Evaluation of the elite schools of sport: Empirical findings from an individual and collective point of view. International Review for the Sociology of Sport, 44(2–3), 151–171.

Ericsson, K. A. (2003). Development of elite performance and deliberate practice: An update from the perspective of expert performance approach. In J. L. Starkes & K. A. Ericsson (Eds.), Expert performance in sports: Advances in research on sport expertise (pp. 49–84). Champaign, IL: Human Kinetics.

Ericsson, K. A. (2008). Deliberate practice and acquisition of expert performance: A general overview. Academic Emergency Medicine, 15(11), 988–994. doi: 10.1111/j.1553-2712.2008.00227.x

Ericsson, K. A. (2013). Training history, deliberate practice and elite sports performance: An analysis in response to Tucker and Collins review—what makes champions? British Journal of Sports Medicine, 47(9), 533-535.

Ericsson, K. A. (2016). Summing up hours of any type of practice versus identifying optimal practice activities: Commentary on Macnamara, Moreau, & Hambrick. Perspectives on Psychological Science, 11(3), 351–354. Doi: 10.1177/1745691616635600

Ericsson, K. A., Krampe, R. T., & Tesch-Römer, C. (1993). The role of deliberate practice in the acquisition of expert performance. Psychological Review, 100, 363–406. doi: 10.1037/0033-295X.100.3.363

Ericsson, K. A., & Lehmann, A. C. (1996). Expert and exceptional performance: Evidence of maximal adaptation to task constraints. Annual Review of Psychology, 47, 273–305.

Erikstad, M. K., Høigaard, R., Johansen, B. T., Kandala, N., & Haugen, T. (2018). Childhood football play and practice in relation to self-regulation and national team selection: a study of Norwegian elite youth players. Journal of Sports Sciences, 36(20), 2304-2310. doi: 10.1080/02640414.2018.1449563

European Commission (2015). Translation quality guidelines. Luxembourg: Directorate-general for translation.

Farrow, D., Reid, M., Buszard, T., & Kovalchik, S. (2018). Charting the development of sport expertise: challenges and opportunities. International Review of Sport and Exercise Psychology, 11(1), 238–257. doi: 10.1080/1750984X.2017.1290817

Ferguson, B., & Stern, P. J. (2014). A case of early sports specialization in an adolescent athlete. Journal of the Canadian Chiropractic Association, 58(4), 377-383.

Ferreira, F. S., Mota, J., & Duarte, J.A. (2014). Patterns of physical activity in Portuguese adolescents. Evaluation during physical education classes through accelerometry. Archives of Exercise in Health and Disease, 4(2), 280–285.

Field, A. (2009). Discovering statistics using IBM SPSS statistics (3rd ed.). London: Sage.

Field, A. (2013). Discovering statistics using IBM SPSS statistics (4th ed.). London: Sage.

Flatau, J., & Emrich, E. (2011). Die Organisation sportlichen Erfolges – Zur Frage nach Markt oder Hierarchie im Spitzensport am Beispiel der Eliteschulen des Sports [The Organisation of Success in Sport – On the Question of Market or Hierarchy in Elite Sports Exemplified by Elite Sport Schools]. Sportwissenschaft, 41(2), 100–111.

Flatau, J., & Emrich, E. (2013). Asset specificity in the promotion of elite sports: Efficient institutions of governance for the production of long-term future sporting success. International Journal of Sport Finance, 8(4), 327-34.

Ford, P., Carling, C., Garces, M., Marques, M., Miguel, C., Farrant, A., … Williams, A. M. (2012). The developmental activities of elite soccer players aged under- 16 years from Brazil, England, France, Ghana, Mexico, Portugal and Sweden. Journal of Sports Sciences, 30(15), 1653–1663.

Ford, P., Coughlan, E., & Williams, M. (2009). The expert-performance approach as a framework for understanding and enhancing coaching performance, expertise and learning. International Journal of Sports Science & Coaching, 4(3), 451– 463.

Ford, P. R., Coughlan, E. K., Hodges, N. J., & Williams, A. M. (2015). Deliberate practice in sport. In J. Baker & D. Farrow (Eds.), Routledge handbook of sport expertise (pp. 347-362). London: Routledge. Doi: 10.13140/RG.2.1.2442.9042

Ford, P. R., Croix, M. D., Lloyd, R., Meyers, R., Moosavi, M., Oliver, J. L., Till, K., & Williams, C. (2011). The long-term athlete development model: Physiological evidence and application. Journal of sports sciences, 29(4), 389- 402. Doi: 10.1080/02640414.2010.536849

Ford, P. R., Low, J., McRobert, A. P., & Williams, A. M. (2010). Developmental activities that contribute to high or low performance by elite cricket batters when recognizing type of delivery from bowlers’ advanced postural cues. Journal of Sport & Exercise Psychology, 32, 638–654. doi: 10.1123/jsep.32.5.638


Ford, P. R., Ward, P., Hodges, N. J., & Williams, A. M. (2009). The role of deliberate practice and play in career progression in sport: The early engagement hypothesis. High Ability Studies, 20(1), 65-75. Doi: 10.1080/13598130902860721

Ford, P. R., & Williams, A. M. (2008). The effect of participation in gaelic football on the development of irish professional soccer players. Journal of Sport & Exercise Psychology, 30, 709-722.

Ford, P. R., & Williams, A. M. (2012). The developmental activities engaged in by elite youth soccer players who progressed to professional status compared to those who did not. Psychology of Sport & Exercise, 13, 349–352.

Ford, P. R., Yates, I., & Williams, A. M. (2010). An analysis of practice activities and instructional behaviours used by youth soccer coaches during practice: Exploring the link between science and application. Journal of Sports Sciences, 28, 483–495. doi: 10.1080/02640410903582750

Forsman, H., Blomqvist, M., Davids, K., Konttinen, N. & Liukkonen, J. (2016). The role of sport-specific play and practice during childhood in the development of adolescent Finnish team sport athletes. International Journal of Sports Science & Coaching, 11(1), 69–77.

Fransen, J., Pion, J., Vandendriessche, J., Vandorpe, B., Vaeyens, R., Lenoir, M., & Philippaerts, R. M. (2012). Differences in physical fitness and gross motor coordination in boys aged 6–12 years specializing in one versus sampling more than one sport. Journal of Sports Sciences, 30(4), 379–386.

Fraser-Thomas, J., Côté, J., & Deakin, J. (2008). Examining adolescent sport dropout and prolonged engagement from a developmental perspective. Journal of Applied Sport Psychology, 20, 318–333. doi: 10.1080/10413200802163549

Fritz, C. O., Morris, P. E. & Richler, J. J. (2012). Effect size estimates: Current use, calculations, and interpretation. Journal of Experimental Psychology, 141(1), 2–18. Doi: 10.1037/a0024338

Galton, F. (1865). Hereditary Character and Talent. Macmillan's Magazine, 12, pp. 157-166.

Galton, F. (1869). Hereditary Genius: An inquiry into its laws and consequences. Macmillan/Fontana, London.

Galton, F. (1883). Inquiries into human faculty and its development. AMS Press, New York.

Garson, G. D. (2016). Validity and reliability. Asheboro, NC: Statistical Publishing Associates.

Gay, L. R., Mills, G. E. & Airasian, P. W. (2012) Educational research: Competencies for analysis and application (10th ed.). Upper Saddle River: Pearson.

Gibson, J. J. (1977). The theory of affordances. In R. E. Shaw & J. Bransford (Eds.), Perceiving, acting, and knowing: Toward an ecological psychology (pp. 67– 82). Hillsdale, NJ: Lawrence Erlbaum Associates.

Goodway, J. D., & Robinson, L. E. (2015). Developmental trajectories in early sport specialization: A case for early sampling from a physical growth and motor development perspective. Kinesiology Review, 4(3), 267-278. http://dx.doi.org/10.1123/kr.2015-0028


Gulbin, J. P., Oldenziel, K. E., Weissensteiner, J. R., & Gagné, F. (2010). A look through the rear view mirror: Developmental experiences and insights of high performance athletes. Talent Development & Excellence, 2(2), 149–164.

Gulbin, J. P., Croser, M. J., Morley, E. J., & Weissensteiner, J. R., (2013). An integrated framework for the optimisation of sport and athlete development: a practitioner approach. Journal of Sports Science, 31, 1319–1331. http://dx.doi.org/10.1080/02640414.2013.781661

Gulbin, J., Weissensteiner, J. R., Oldenziel, K., & Gagné, F. (2013). Patterns of performance development in elite athletes. European Journal of Sport Science, 13, 605–614. doi: 10.1080/17461391.2012.756542


Güllich, A. (2019). “Macro-structure” of developmental participation histories and “micro-structure” of practice of German female world-class and national-class football players. Journal of Sports Sciences, 37(12), 1347-1355. doi: 10.1080/02640414.2018.1558744

Güllich, A. (2014). Many roads lead to Rome – Developmental paths to Olympic gold in men's field hockey. European Journal of Sport Science, 14(8), 763-771. Doi: 10.1080/17461391.2014.905983

Güllich, A., & Emrich, E. (2014). Considering long-term sustainability in the development of world class success. European Journal of Sport Science, 14(Suppl.1), S383–S397.

Güllich, A., & Emrich, E. (2012). Individualistic and collectivistic approach in athlete support programmes in the German high-performance sport system. European Journal for Sport and Society, 9(4), 243–68.

Hall, S., & Getchell, N. (2014) Research methods in kinesiology and health sciences. Philadelphia, PA: Lippincott, Williams & Wilkins.

Hall, E. T., Gray, S., & Sproule, J. (2016). The microstructure of coaching practice: Behaviours and activities of an elite rugby union head coach during preparation and competition. Journal of Sports Sciences, 34(10), 896–905. doi: http://dx.doi.org/10.1080/02640414.2015.1076571

Hambrick, D. Z., Oswald, F. L., Altmann, E. M., Meinz, E. J., Gobet, F., & Campitelli, G. (2014). Deliberate practice: Is that all it takes to become an expert? Intelligence, 45, 34–45.

Harvey, S., Cushion, C. J., Cope, E., & Muir B. (2013). A season long investigation into coaching behaviours as a function of practice state: The case of three collegiate coaches. Sports Coaching Review, 2(1), 13–32. doi: http://dx.doi.org/10.1080/21640629.2013.837238 

Haugaasen, M. (2015). Retracing the steps towards professional football: Practice engagement characteristics and performance attainment among Norwegian elite youth and senior players. PhD thesis, Norwegian School Of Sport Sciences. Retrieved from https://nih.brage.unit.no/nih- xmlui/handle/11250/2356463

Haugaasen, M., Toering, T., & Jordet, G. (2014a). From childhood to senior professional football: A multi-level approach to elite youth football players’ engagement in football-specific activities. Psychology of Sport and Exercise, 15(4), 336–344.

Haugaasen, M., Toering, T. T., & Jordet, G. (2014b). From childhood to senior professional football: elite youth players’ engagement in non-football activities. Journal of Sports Science, 32, 1940–1949. doi: 10.1080/02640414.2014.970218


Hayman, R., Polman, R., Taylor, J., Hemmings, B., & Borkoles, E. (2011). Development of elite adolescent golfers. Talent Development & Excellence, 3(2), 249–261.

Helsen, W. F., Starkes, J. L., & Hodges, N. J. (1998). Team sports and the theory of deliberate practice. Journal of Sport & Exercise Psychology, 20, 12–34.

Hendry, D. T., Crocker, P. R. E., Williams, A. M., & Hodges, N. J. (2019). Tracking and comparing self-determined motivation in elite youth soccer: Influence of developmental activities, age, and skill. Frontiers in Psychology, 10, 304. doi: 10.3389/fpsyg.2019.00304

Hendry, D. T., & Hodges, N. J. (2018). Early majority engagement pathway best defines transitions from youth to adult elite men's soccer in the UK: A three time-point retrospective and prospective study. Psychology of Sport & Exercise, 36, 81-89.

Hendry, D. T., Williams, A. M., Ford, P. R., & Hodges, N. J. (2019). Developmental activities and perceptions of challenge for national and varsity women soccer players in Canada. Psychology of Sport & Exercise, 43, 210-218.

Hendry, D. T., Williams, A. M., & Hodges, N. J. (2018). Coach ratings of skills and their relations to practice, play and successful transitions from youth-elite to adult-professional status in soccer. Journal of Sports Sciences, 36(17), 2009- 2017. Doi: 10.1080/02640414.2018.1432236

Hill, G. M. (1993). Youth sport participation of professional baseball players. Sociology of Sport Journal, 10, 107–114.

Hill, G. M., & Hansen, G. F. (1988). Specialization in high school sports - The pros and cons. Journal of Physical Education, Recreation & Dance, 59(5), 76-79. doi: 10.1080/07303084.1988.10609762

Hill, G. M., & Simons, J. (1989). A study of the sport specialization on high school athletics. Journal of Sport and Social Issues, 13(1), 1–13. https://doi.org/10.1177/019372358901300101

Hodge, T., & Deakin, J. M. (1998). Deliberate practice and expertise in the martial arts: The role of context in motor recall. Journal of Sport & Exercise Psychology, 20, 260–279.

Hodges, N.J., Kerr, T., Starkes, J.L., & Weir, P.L. (2004). Predicting performance times from deliberate practice hours for triathletes and swimmers: What, when, and where is practice important? Journal of Experimental Psychology, 10, 219–237.

Hodges, N. J., & Starkes, J. L. (1996). Wrestling with the nature expertise: A sport specific test of Ericsson, Krampe and Tesch-Römer’s (1993) theory of “deliberate practice”. International Journal of Sport Psychology, 27(4), 400– 424.

Hollis, J. L., Sutherland, R. L., Williams, A., Campbell, E. M., Nathan, N., Wolfenden, L., ... Wiggers, J. H. (2017). A systematic review and meta- analysis of moderate-to-vigorous physical activity levels in secondary school physical education lessons. International Journal of Behavioral Nutrition and Physical Activity, 14(52).

Holt, N. L., Pankow, K., Tamminen, K. A., Strachan, L., MacDonald, D. J., Fraser- Thomas, J., … Camiré, M. (2018). A qualitative study of research priorities among representatives of Canadian provincial sport organizations. Psychology of Sport & Exercise, 36, 8-16. Doi: https://doi.org/10.1016/j.psychsport.2018.01.002.

Hopwood, M. J. (2015). Issues in the collection of athlete training histories. In J. Baker & D. Farrow (Eds.), Routledge handbook of sport expertise (pp. 156– 165). Florence: Routledge.

Hopwood, M. (2013). The developmental history of athletes questionnaire: towards a comprehensive understanding of the development of sport expertise. PhD thesis, Victoria University. Retrieved from http://vuir.vu.edu.au/22353/

Hopwood, M. J., Baker, J., MacMahon, C., & Farrow, D. (2010). Reliability and validity of the developmental history of athletes questionnaire (DHAQ). Canadian Society for Psychomotor Learning and Sport Psychology Conference, Ottawa, Canada.

Hopwood, M. J., Farrow, D., MacMahon, C., & Baker, J. (2011). Sporting milestones and career progression of male Australian junior international level team sport athletes. Canadian Society for Psychomotor Learning and Sport Psychology Conference, Winnipeg, Canada.

Hopwood, M. J., Farrow, D., Baker, J., & MacMahon, C. (2012). Questioning the importance of diversification for sport expertise development. Journal of Sport & Exercise Psychology, 34, S236.

Hopwood, M. J., MacMahon, C., Farrow, D., & Baker, J. (2015). Is practice the only determinant of sporting expertise? Revisiting Starkes (2000). International Journal of Sport Psychology, 46, 631-651. doi: 10.7352/IJSP 2015.46.63

Hornig, M., Aust, F., & Güllich, A. (2016). Practice and play in the development of German top-level professional football players. European Journal of Sport Science, 16(1), 96–105. doi: http://dx.doi.org/10.1080/17461391.2014.982204

Hüttermann, S., Memmert, D., & Baker, J. (2014). Understanding the microstructure of practice: Training differences between various age classes, expertise levels and sports. Talent Development & Excellence, 6(2), 17–29.

Huxley, D. J., O’Connor, D., & Larkin, P. (2017). The pathway to the top: Key factors and influences in the development of Australian Olympic and World Championship Track and Field athletes. International Journal of Sports Science & Coaching, 12(2), 264–275.

Iskra, J., Zajac, A., & Waskiewicz, Z. (2006). Laboratory and field tests in evaluation of anaerobic fitness in elite hurdlers. Journal of Human Kinetics, 16, 25.

Jayanthi, N. A., LaBella, C. R., Fischer, D., Pasulka, J., & Dugas, L. R. (2015). Sports-specialized intensive training and the risk of injury in young athletes: A clinical case-control study. The American Journal of Sports Medicine, 43(4), 794-801. doi: 10.1177/0363546514567298

Jayanthi, N., Pinkham, C., Dugas, L., Patrick, B., & Labella, C. (2013). Sports specialization in young athletes: Evidence-based recommendations. Sports Health, 5, 251–257. doi: 10.1177/1941738112464626


Kearney, P. E., Carson, H. J., & Collins, D. (2018). Implementing technical refinement in high-level athletics: Exploring the knowledge schemas of coaches. Journal of Sports Sciences, 36(10), 1118-1126. doi: 10.1080/02640414.2017.1358339

Kim, H. B., Kim, S. H., & So, W. Y. (2015). The relative importance of performance factors in Korean archery. Journal of Strength & Conditioning Research, 29(5), 1211-1219.

Kinnerk, P., Harvey, S., Kearney, P., MacDonncha, C., & Lyons, M. (2019). An investigation of the self-reported practice activities and session sequencing of inter county Gaelic football coaches. International Sport Coaching Journal, 6(2), 211–219. doi: https://doi.org/10.1123/iscj.2018-0090

Krasilshchikov, O. (2014). Fitness profile of Malaysian adolescent squash players. Malaysian Journal of Movement, Health & Exercise, 3. doi:https://doi.org/10.15282/mohe.v3i0.16

Kristiansen, E., & Houlihan, B. (2017). Developing young athletes: The role of private sport schools in the Norwegian sport system. International Review for the Sociology of Sport, 52(4), 447– 469. https://doi.org/10.1177/1012690215607082

Landis, J. R., & Koch, G. G. (1977). The measurement of observer agreement for categorical data. Biometrics, 33, 159-174.

LaPrade, R. F., Agel, J., Baker, J., Brenner, J. S., Cordasco, F. A., Côté, J., … Provencher, M. T. (2016). AOSSM early sport specialization consensus statement. Orthopaedic Journal of Sports Medicine, 4(4). doi: 10.1177/2325967116644241


Larkin, P., O’Connor, D., & Williams, A.M. (2016). Does grit influence sport-specific engagement and perceptual-cognitive expertise in elite youth soccer? Journal of Applied Sport Psychology, 28(2), 129-138. doi: 10.1080/10413200.2015.1085922

Law, M. P., Côté, J. & Ericsson, K. A. (2007). Characteristics of expert development in rhythmic gymnastics: A retrospective study. International Journal of Sport and Exercise Psychology, 5(1), 82-103. doi: 10.1080/1612197X.2008.9671814

Leite, N. M. C., & Sampaio, J. E. (2012). Long-term athletic development across different age groups and gender from Portuguese basketball players. International Journal of Sports Science & Coaching, 7(2), 285–300. https://doi.org/10.1260/1747-9541.7.2.285

Lombardo, M. P., Deaner, R. O. (2014). You can’t teach speed: Sprinters falsify the deliberate practice model of expertise. PeerJ, 2(e445). https://doi.org/10.7717/peerj.445

Low, J. F. L., Mohamad, N. I., Ong, K. B., Aziz, S. A., Abdullah, M. R., & Maliki, A. B. H. M. (2017). The developmental pathways of Malaysian elite youth badminton players. Journal of Fundamental and Applied Sciences, 9(2S), 842- 857. http://dx.doi.org/10.4314/jfas.v9i2s.60

Low, J., Williams, A. M., McRobert, A. P., & Ford, P. R. (2013). The microstructure of practice activities engaged in by elite and recreational youth cricket players. Journal of Sports Sciences, 31(11), 1242–1250. doi: http://dx.doi.org/10.1080/02640414.2013.778419

MacDonald, D. J., Côté, J., Eys, M., & Deakin, J. (2011). The role of enjoyment and motivational climate in relation to the personal development of team sport athletes. The Sport Psychologist, 25, 32-46.

MacDonald, D. J., Horton, S., Kraemer, K., Weir, P., Deakin, J., & Côté, J. (2009). Application and reliability of the retrospective interview procedure to trace physical activity patterns in master athletes and nonactive older adults. Educational Gerontology, 35(12), 1107–1122.

MacNamara, A., & Collins, D. (2014). More of the same? Comment on “An integrated framework for the optimisation of sport and athlete development: A practitioner approach”. Journal of Sports Sciences, 32(8), 793-795. doi: 10.1080/02640414.2013.855805

Macnamara, B. N., Moreau, D., & Hambrick, D. Z. (2016). The relationship between deliberate practice and performance in sports: A meta-analysis. Perspectives on Psychological Science, 11, 333-350.

Magill, R., & Anderson, D. I. (2017). Motor learning and control: concepts and applications (11th ed.). New York: McGraw-Hill.

Malina, R. M. (2010). Early sport specialization: Roots, effectiveness, risks. Current Sports Medicine Reports, 9(6), 364–371.

McKenzie, T. L., & Van Der Mars, H. (2015). Top 10 research questions related to assessing physical activity and its contexts using systematic observation. Research Quarterly for Exercise and Sport, 86(1), 13–29. doi:10.1080/02701367.2015.991264

Memmert, D., Baker, J., & Bertsch, C. (2010). Play and practice in the development of sport‐specific creativity in team ball sports. High Ability Studies, 21(1), 3- 18. doi: 10.1080/13598139.2010.488083

Miller, S. D., Chow, D., Wampold, B. E., Hubble, M. A., Del Re, A. C., Maeschalck, C., & Bargmann, S. (2018). To be or not to be (an expert)? Revisiting the role of deliberate practice in improving performance. High Ability Studies, doi: 10.1080/13598139.2018.1519410

Ministry of Education Malaysia (MOE). (2011). Buku panduan pelaksanaan dasar satu murid satu sukan. Sports division, MOE, Putrajaya.

Ministry of Education Malaysia (MOE). (2016a). Malaysia sports school. Retrieved from http://www.moe.gov.my/en/Sekolah-Sukan-Malaysia-BS  

Ministry of Education Malaysia (MOE). (2016b). Sukan prestasi tinggi sekolah [School high performance sports]. Retrieved from http://www.mssj.edu.my/i- spts/

Ministry of Youth & Sports Malaysia. (2014). National football development plan phase 1 2014-2020. Putrajaya: Kementerian Belia dan Sukan, Malaysia.

Moeijes, J., van Busschbach, J. T., Bosscher, R. J., & Twisk, J. W. R. (2019). Sports participation and health-related quality of life: a longitudinal observational study in children. Quality of Life Research, 28(9), 2453-2469. https://doi.org/10.1007/s11136-019-02219-4

Moesch, K., Elbe, A.-M., Hauge, M.-L. T., Wikman, J. M. (2011). Late specialization: The key to success in centimeters, grams, or seconds (cgs) sports. Scandinavian Journal of Medicine & Science in Sports, 21(6), E282– 290.

Moesch, K., Hauge, M. T., Wikman, J. M., & Elbe, A. (2013). Making it to the top in team sports: Start later, intensify, and be determined! Talent Development & Excellence, 5(2), 85–100.

Myer, G. D., Jayanthi, N., DiFiori, J. P., Faigenbaum, A. D., Kiefer, A. W., Logerstedt, D., & Micheli, L. J. (2016). Sports specialization, part II: Alternative solutions to early sport specialization in youth athletes. Sports Health, 8(1), 65–73. https://doi.org/10.1177/1941738115614811

Newell, A., & Rosenbloom, P. S. (1981). Mechanisms of skill acquisition and the law of practice. In J. R. Anderson (Ed.), Cognitive skills and their acquisition (pp. 1–55). Hillsdale, NJ: Erlbaum.

National Sports Council. (2019). Retrieved from https://www.nsc.gov.my/program- atlet-2/

O’Connor, D., Larkin, P., & Williams, A. M. (2018). Observations of youth football training: How do coaches structure training sessions for player development? Journal of Sports Sciences, 36(1), 39–47. doi: 10.1080/02640414.2016.1277034

O'Donoghue, P., Girard, O., & Reid, M. (2013). Racket sports. In T. McGarry, P. O’Donoghue, & J. Sampaio (Eds.), Routledge handbook of sports performance analysis (pp.404-414). New York: Routledge.

Ogden, J., & Edwards, J. R. (2016). Are Canadian stakeholders resting on their laurels? A comparative study of the athlete pathway through the Swedish and Canadian male ice hockey systems. Journal of Sport Management, 30(3), 312- 328.

Otsuka, M., & Isaka, T. (2019). Intra-athlete and inter-group comparisons: Running pace and step characteristics of elite athletes in the 400-m hurdles. PLoS ONE,14(3), e0204185. https://doi.org/10.1371/journal.pone.0204185

Pankhurst, A., & Collins, D. (2013). Talent identification and development: The need for coherence between research, system, and process. Quest, 65(1), 83-97. doi: 10.1080/00336297.2012.727374

Partington, M., & Cushion, C. (2013). An investigation of the practice activities and coaching behaviors of professional top-level youth soccer coaches. Scandinavian Journal of Medicine and Science in Sports, 23, 374–382. doi: 10.1111/j.1600-0838.2011.01383.x

Pluhar, E., McCracken, C., Griffith, K. L., Christino, M. A., Sugimoto, D., & Meehan III, W. P. (2019). Team sport athletes may be less likely to suffer anxiety or depression than individual sport athletes. Journal of sports science & medicine, 18(3), 490.

Post, E. G., Thein-Nissenbaum, J. M., Stiffler, M. R., Brooks, M. A., & Bell, D. R. (2017). High school sport specialization patterns of current Division I athletes. Sports Health, 9(2), 148–153.

Post, E. G., Trigsted, S. M., Riekena, J. W., Hetzel, S., McGuine, T. A., Brooks, M. A., & Bell, D. R. (2017). The association of sport specialization and training volume with injury history in youth athletes. The American Journal of Sports Medicine, 45(6), 1405–1412.

Powers, S. K., & Howley, E. T. (2018). Exercise physiology: Theory and application to fitness and performance (10th ed.). New York: McGraw-Hill.

Radtke, S., & Coalter, F. (2007). Sports schools: An international review (Report to the Scottish Institute of Sport Foundation). Stirling: University of Stirling.

Raya-Castellano, P. E., & Uriondo, L. F. (2015). A review of the multidisciplinary approach to develop elite players at professional football academies: Applying science to a professional context. International Journal of Performance Analysis in Sport, 15, 1–19. doi: https://doi.org/10.1080/24748668.2015.11868773

Reeves, M. J., Roberts, S. J., McRobert, A. P., & Littlewood, M. A. (2018). Factors affecting the identification of talented junior-elite footballers: A case study. Soccer & Society, 19(8), 1106-1121. doi: 10.1080/14660970.2018.1432383

Rees, T., Hardy, L., Güllich, A., Abernethy, B., Côté, J., Woodman, T., … Warr, C. (2016). The great British medalists project: A review of current knowledge on the development of the world’s best sporting talent. Sports Medicine, 46, 1041–1058. doi: 10.1007/s40279-016-0476-2

Renshaw, I., & Chow, J-Y. (2019). A constraint-led approach to sport and physical education pedagogy. Physical Education and Sport Pedagogy, 24(2), 103-116. doi: 10.1080/17408989.2018.1552676

Roca, A., Williams, M., & Ford, P. R. (2012). Developmental activities and the acquisition of superior anticipation and decision making in soccer players. Journal of Sports Sciences, 30, 1643–1652. doi: 10.1080/02640414.2012.701761

Rothwell, M., Stone, J. A., Davids, K., & Wright, C. (2017). Development of expertise in elite and sub-elite British rugby league players: A comparison of practice experiences. European Journal of Sport Science, 17(10), 1252–1260. doi: 10.1080/17461391.2017.1380708

Rushall, B. S. (1977). Two observational schedules for sporting and physical education environments. Canadian Journal of Applied Sports Sciences, 2, 15– 21.

Russell, W. D. (2014). The relationship between youth sport specialization, reasons for participation, and youth sport participation motivations: A retrospective study. Journal of Sport Behavior, 37(3), 286-305.

Russell, W. D., & Limle, A. N. (2013). The relationship between youth sport specialization and involvement in sport and physical activity in young adulthood. Journal of Sport Behavior, 36(1), 82-98.

Rüst, C. A., Knechtle, B., Knechtle, P., Rosemann, T., & Lepers, R. (2012). Age of peak performance in elite male and female ironman triathletes competing in ironman Switzerland, a qualifier for the ironman world championship, ironman Hawaii, from 1995 to 2011. Open Access Journal of Sports Medicine, 3, 175–182. doi:10.2147/OAJSM.S37115

Rutten, E. A., Stams, G. J. J., Biesta, G. J., Schuengel, C., Dirks, E., & Hoeksma, J. B. (2007). The contribution of organized youth sport to antisocial and prosocial behavior in adolescent athletes. Journal of youth and adolescence, 36(3), 255- 264

Schmidt, R, & Lee, T. (2014). Motor learning and performance: from principles to application (5th ed.). Champaign, IL: Human Kinetics.

Schulz, R., & Curnow, C. (1988). Peak performance and age among superathletes track and field, swimming, baseball, tennis, and golf. Journal of Gerontology, 43(5), 113-120.

Shrout, P. E., & Fleiss, J. L. (1979). Intraclass correlations: Uses in assessing rater reliability. Psychological Bulletin, 86(2), 420-428.

Siedentop, D., & Tannehill, D. (2000). Developing teaching skills in physical education (4th ed.). London: Mayfield Publishing Company.

Sieghartsleitner, R., Zuber, C., Zibung, M., & Conzelmann, A. (2018). “The early specialised bird catches the worm!” – A specialised sampling model in the development of football talents. Frontiers in Psychology, 9(188). doi: 10.3389/fpsyg.2018.00188

Simon, H. A., & Chase, W. G. (1973). Skill in chess. American Scientist, 61, 394– 403.

Singer, R. N., & Janelle, C. M. (1999). Determining sport expertise: from genes to supremes. International Journal of Sport Psychology, 30(2), 117–150.

Smith, M. M. (2015). Early sport specialization: A historical perspective. Kinesiology Review, 4(3), 220–229. https://doi.org/10.1123/kr.2015-0024

Smith, N. J., Monnat, S. M., & Lounsbery, M. A. (2015). Physical activity in physical education: Are longer lessons better? Journal of School Health, 85(3), 141– 148.

Soberlak, P., & Côté, J. (2003). The developmental activities of elite ice hockey players. Journal of Applied Sport Psychology, 15(1), 41- 49. doi: 10.1080/10413200305401

Sport Excel. (2019). Retrieved from https://www.sportexcel.org.my/mainpage/ Starkes, J. L. (2000). The road to expertise: Is practice the only determinant? International Journal of Sport Psychology, 31, 431–451.

Starkes, J. L., Deakin, J., Allard, F., Hodges, N. J., & Hayes, A. (1996). Deliberate practice in sports: What is it anyway? In K. A. Ericsson (Ed.), The road to excellence: The acquisition of expert performance in the arts and sciences, sports, and games (pp. 81–106). Mahwah, NJ: Lawrence Erlbaum Associates.

Stonebridge, I., & Cushion, C. (2018). An exploration of the relationship between educational background and the coaching behaviours and practice activities of professional youth soccer coaches. Physical Education and Sport Pedagogy, 23(6), 636–656. doi: 10.1080/17408989.2018.1485143

Storm, L. K., Kristoffer, H., & Krogh, C. M. (2012). Specialization pathways among elite Danish athletes: A look at the developmental model of sport participation from a cultural perspective. International Journal of Sport Psychology, 43(3), 199–223.

Suppiah, H. T.,
Low, C. Y., & Chia, M. (2015). Detecting and developing youth athlete potential: different strokes for different folks are warranted. British Journal of Sports Medicine, 0, 1–7. doi:10.1136/bjsports-2015-094648

Survey Research Center. (2016). Guidelines for Best Practice in Cross-Cultural Surveys. Ann Arbor, MI: Survey Research Center, Institute for Social Research, University of Michigan. Retrieved from http://www.ccsg.isr.umich.edu/

Swann, C., Moran, A., & Piggott, D. (2015). Defining elite athletes: Issues in the study of expert performance in sport psychology. Psychology of Sport & Exercise, 16, 3–14.

Takai, H., Kubo, Y., & Araki, M. (2012). Characteristics of shooting time of the world’s top level male archery athletes. NSSU Journal of Sport Sciences, 1, 8- 12.

Thomas, J. R., Nelson, J. K., & Silverman, S. J. (2011). Research methods in physical activity (6th ed.). Champaign, IL: Human Kinetics.

Tomczak, M., & Tomczak, E. (2014). The need to report effect size estimates revisited. An overview of some recommended measures of effect size. Trends in Sport Sciences, 1(21), 19-25.

Torres, C. R. (2015). Better early than late? A philosophical exploration of early sport specialization. Kinesiology Review, 4(3), 304-316. https://doi.org/10.1123/kr.2015-0020

Tucker, R., & Collins, M. (2012). What makes champions? A review of the relative contribution of genes and training to sporting success. British Journal of Sports Medicine, 46, 555-561.

Tucker, R., Santos-Concejero, J., Collins, M. (2013). The genetic basis for elite running performance. British Journal of Sports Medicine, 47, 545-549.

UK Sport. (2017). Retreived from https://www.uksport.gov.uk/

United Nations. (2018). World urbanization prospects: The 2018 revision. Retrieved from https://population.un.org/wup/Country-Profiles/

Vaeyens, R., Güllich, A., Warr, C. R., & Philippaerts, R. (2009). Talent identification and promotion programmes of Olympic athletes. Journal of Sports Sciences, 27(13), 1367–1380.

van der Mars, H. (1989). Systematic observation: An introduction. In P. W. Darst, D. B. Zakrajsek, & V. H. Mancini (Eds.), Analysing physical education (2nd ed., pp. 3–19). Champaign, IL: Human Kinetics.

van Rens, F. E., Elling, A., & Reijgersberg, N. (2015). Topsport Talent Schools in the Netherlands: A retrospective analysis of the effect on performance in sport and education. International Review for the Sociology of Sport, 50(1), 64–82.

Vella, S. A., Cliff, D. P., Magee, C. A., & Okely, A. D. (2014). Sports participation and parent-reported health-related quality of life in children: Longitudinal associations. Journal of Pediatrics, 164(6), 1469-1474.

Ward, P., Hodges, N. J., Starkes, J. L., & Williams, A. M. (2007). The road to excellence: Deliberate practice and the development of expertise. High Ability Studies, 18, 119–153.

Watson, A., & Brickson, S. (2019). Relationships between sport specialization, sleep, and subjective well-being in female adolescent athletes. Clinical Journal of Sport Medicine, 29(5), 384-390.

Wiersma, L. D. (2000). Risks and benefits of youth sport specialization: Perspectives and recommendations. Pediatric Exercise Science, 12, 13-22.

Wiium, N., & Säfvenbom, R. (2019). Participation in organized sports and self- organized physical activity: Associations with developmental factors. International Journal of Environmental Research and Public Health, 16(4), 585. MDPI AG. Doi: http://dx.doi.org/10.3390/ijerph16040585

Williams, A. M., & Hodges, N. J. (2005). Practice, instruction and skill acquisition: Challenging tradition. Journal of Sports Sciences, 23, 637–650. doi: 10.1080/02640410400021328

World Archery Federation. (2019). Target archery. Retrieved from https://worldarchery.org/rulebook

World Health Organisation (WHO). 2015. Process of translation and adaptation of instruments. Retrieved from https://www.who.int/substance_abuse/research_tools/translation/en/

Zibung, M., & Conzelmann, A. (2013). The role of specialisation in the promotion of young football talents: A person-oriented study. European Journal of Sport Science, 13(5), 452-460. doi: 10.1080/17461391.2012.749947