1. Abdul Aziz, N. S., Wan Ahmad, W. F., & Hashim, A. S. (2016). The design of mobile numerical application development lifecyle for children with autism. Jurnal Teknologi, 2, 77–83. 2. Ahmad, M., Rahim, L. A. B., & Arshad, N. I. (2015). An analysis of educational games design frameworks from software engineering perspective. Journal of ICT, 14(2015), 123–151. 3. Ahmad Zaki, N. A., Tengku Wook, T. S. M., & Ahmad, K. (2015). Analysis and classification of serious games for cognitive stimulation. The 5th International Conference on Electrical Engineering and Informatics 2015 (pp. 685–690). 3. Ahmad Zaki, N. A., Tengku Wook, T. S. M., & Ahmad, K. (2017). Towards developing a therapeutic serious game design model for stimulating cognitive abilities: A case for children with speech and language delay. Advances in Intelligent Systems and Computing, 532, 259–269. https:// doi.org/10.1007/978-3-319-48517-1_23 4. Aziz, N. S. A., Ahmad, W. F. W., & Zulkifli, J. (2015). User experience on numerical application between children with down syndrome and autism. Proceedings of CHI UX Indonesia 2015 (CHIuXiD 2015), 26– 31. https://doi.org/10.1145/2742032.2742036 5. Barak, B., & Schiffman, L. G. (1981). Cognitive age: A nonchronological age variable. Advances in Consumer Research, 8, 602–606. 6. Barendregt, W., & Bekker, M. M. (2004). Towards a framework for design guidelines for young children’s computer games, 3166, 365–376. https://doi.org/10.1007/978-3-540-28643-1_47 7. Blumberg, F. C., & Fisch, S. M. (2013). Introduction: Digital games as a context for cognitive development, learning, and developmental research. In F. C. Blumberg & S. M. Fisch (Eds.), Digital games: A context for cognitive development. New directions for child and adolescent development (pp. 1–9). https://doi.org/10.1002/cad 8. Bonnier, C. (2008). Evaluation of early stimulation programs for enhancing brain development. Acta Paediatrica, International Journal of Paediatrics, 97(7), 853–858. https://doi.org/10.1111/j.1651-2227.2008. 00834.x 9. Boot, W. R., Champion, M., Blakely, D. P., Wright, T., Souders, D. J., & Charness, N. (2013). Video games as a means to reduce age-related cognitive decline: Attitudes, compliance, and effectiveness. Frontiers in Psychology, 4(February), 31. https://doi.org/10.3389/fpsyg.2013.00031 10. Buschmann, A., Jooss, B., Rupp, A., Dockter, S., Blaschtikowitz, H., & Heggen, I. (2008). Children with developmental language delay at 24 months of age: Results of a diagnostic work-up. Developmental Medicine & Child Neurology, 50, 223–229. 11. Carvalho, M. B., Bellotti, F., Hu, J., Hauge, J. B., Berta, R., Gloria, A. D., & Rauterberg, M., (2015). Towards a service-oriented architecture framework for educational serious games. Proceedings - IEEE 15th International Conference on Advanced Learning Technologies: Advanced Technologies for Supporting Open Access to Formal and Informal Learning, ICALT 2015, 147–151. https://doi.org/10.1109/ ICALT.2015.145 12. Chiasson, S., & Gutwin, C. (2005). Design principles for children’s technology. Technical Report HCI-TR-05-02, 9. https://doi.org/10.1.1.83.5281 13. De La Guía, E., Lozano, M. D., & Penichet, V. M. R. (2015). Educational games based on distributed and tangible user interfaces to stimulate cognitive abilities in children with ADHD. British Journal of Educational Technology, 46(3), 664–678. https://doi.org/10.1111/bjet.12165 14. de la Guia, E., Lozano, M. D., & R. Penichet, V. M. (2013). Cognitive Rehabilitation based on collaborative and tangible computer games. Proceedings of the ICTs for Improving Patients Rehabilitation Research Techniques, 389–392. https://doi.org/10.4108/pervasive health.2013.252375 15. Devi, K. R., Sen, A. ., & Hemachandran, K. (2012). A working framework for the user-centered design approach and a survey of the available methods. International Journal of Scientific and Research Publications, 2(4), 1–8. 16. Durango, I., Carrascosa, A., Gallud, J. A., & Penichet, V. M. R. (2015). Using serious games to improve therapeutic goals in children with special needs. International Conference on Human-Computer Interaction with Mobile Devices and Services (pp. 743–749). https://doi. org/10.1145/2786567.2793696 17. Gelderblom, H., & Kotzé, P. (2008). Designing technology for young children: What we can learn from theories of cognitive development. Proceedings of the 2008 Annual Research Conference of the South African Institute of Computer Scientists and Information Technologists on IT Research in Developing Countries: Riding the Wave of Technology, (October), 66–75. https://doi.org/10.1145/1456659.1456668 18. Guía, E. De, Penichet, V. M. R., de la Guía, E., Lozana, M. D., & Penichet, V. M. R. (2014). Tangible user interfaces applied to cognitive therapies. Proceedings of IUI 2014 Workshop: Interacting with Smart Objects. 19. Hackman, D. A., Farah, M. J., & Meaney, M. J. (2010). Socioeconomic status and the brain: mechanistic insights from human and animal research. Nature Reviews. Neuroscience, 11(9), 651–659. 20. Hailpern, J., Harris, A., La Botz, R., Birman, B., & Karahalios, K. (2012). Designing visualizations to facilitate multisyllabic speech with children with autism and speech delays. Designing Interactive Systems Conference, 126–135. https://doi.org/10.1145/2317956.2317977 21. Hawa, V. V., & Spanoudis, G. (2014). Toddlers with delayed expressive language: An overview of the characteristics, risk factors and language outcomes. Research in Developmental Disabilities, 35(2), 400–407. https://doi.org/10.1016/j.ridd.2013.10.027 22. Herr, J. (2008). Theories principles and development child (6th ed.).Goodheart-Willcox. Høiseth, M., Giannakos, M. N., & Jaccheri, L. (2013). Research-derived guidelines for designing toddlers’ healthcare games. CHI EA ’13: CHI’13 Extended Abstracts on Human Factors in Computing Systems, 451– 456. https://doi.org/10.1145/2468356.2468436 23. Horne-Moyer, H. L., Moyer, B. H., Messer, D. C., & Messer, E. S. (2014). The use of electronic games in therapy: A review with clinical implications. Current Psychiatry Reports, 16(12). https://doi.org/10.1007/s11920-014-0520-6 24. Hotonu, A., Aldous, A., & Schafer-Dreyer, R. (2011). Including children with speech and language delay in the foundation stage. London: A & C Black 25. Hoyer, W., & Roodin, P. (2009). Adult development and ageing (6th ed.).Boston: McGraw-Hill. 26. Imbeault, F., Bouchard, B., & Bouzouane, A. (2011). Serious games in cognitive training for alzheimer’s patients. 2011 IEEE 1st International Conference on Serious Games and Applications for Health (SeGAH),1–8. 27. Jansen, R., Ceulemans, E., Grauwels, J., Maljaars, J., Zink, I., Steyaert, J.,& Noens, I. (2013). Young children with language difficulties: A dimensional approach to subgrouping. Research in Developmental Disabilities, 34(11), 4115–4124. https://doi.org/10.1016/j.ridd.2013. 08.028 28. Johnson, J. (2010). Designing with the mind in mind: Simple guide to understanding user interface design rules. Morgan Kaufmann. https:// doi.org/10.1016/B978-0-240-81176-5.X0001-9 29. Lafferty, A. E., Gray, S., & Wilcox, M. J. (2005). Teaching alphabetic knowledge to pre-school children with developmental language delay and with typical language development. Child Language Teaching and Therapy, 21(3), 263–277. 30. Lányi, C. S., Brown, D. J., Standen, P., Lewis, J., & Butkute, V. (2012). Results of user interface evaluation of serious games for students with intellectual disability. Acta Polytechnica Hungarica, 9(1), 225–245. https://doi.org/10.1007/978-3-642-14097-6_37 31. Law, J., Garrett, Z., & Nye, C. (2003). Speech and language therapy interventions for children with primary speech and language delay or disorder. Cochrane Database of Systematic Reviews, (3). 32. Lawrence, R., & Bateman, N. (2013). 12 minute consultation: An evidencebased approach to the management of a child with speech and language delay. Clinical Otolaryngology, 38(2), 148–153. https://doi. org/10.1111/coa.12082 33. Lazar, J., Feng, J. H. J., & Hochheiser, H. (2010). Research methods in humancomputer interaction. Evaluation. https://doi.org/10.1002/asi.21187 34. Lieberman, D. a., Fisk, M. C., & Biely, E. (2009). Digital games for youngchildren aged three to six: From research to design. Computers in the Schools, 26(4), 299–313. https://doi.org/10.1080/07380560903360178 35. Schuit, M. Van Der, Segers, E., Balkom, H. Van, & Verhoeven, L. (2011). Research in developmental disabilities. How cognitive factors affect language development in children with intellectual disabilities. Research in Developmental Disabilities, 32(5), 1884–1894. https://doi. org/10.1016/j.ridd.2011.03.015 36. Shaffer, D. R., & Kipp, K. (2014). Developmental psychology: Childhood & adolescence (9th ed.). Belmont: Cengage Learning. 37. Shetty, P. (2012). Speech and language delay in children: A review and the role of a pediatric dentist. Journal of Indian Society of Pedodontics and Preventive Dentistry, 30(2), 103–108. https://doi.org/10.4103/0970- 4388.99979 38. Singleton, N. C., & Shulman, B. B. (2014). Language development:Foundations, processes, and clinical applications (2nd ed.). William Brottmiller. 39. Straker, L., Abbott, R., Collins, R., & Campbell, A. (2014). Evidence-based guidelines for wise use of electronic games by children. Ergonomics, 57(4), 471–489. 40. Szczesna, A., Tomaszek, M., & Wieteska, A. (2012). The methodology of designing serious games for children and adolescents focused on psychology goals. Lecture Notes in Computer Science, 7339 LNBI, 245–255. 41. Tengku Wook, T. S. M., & Salim, S. S. (2013). Guideline for the graphic design of web application for children’s interface. TELCOMNIKA, 11(6), 3130–3133. 42. Tomé, R., Pereira, J., Oliveira, M., Tom, R. M., Tomé, R., Pereira, J., & Oliveira, M. (2014). Using serious games for cognitive disabilities. Serious Games Development and Applications, 8778, 34–47. 43. Tran, P., & Subrahmanyam, K. (2013). Evidence-based guidelines for the informal use of computers by children to promote the development of academic, cognitive and social skills. Ergonomics, 56(9), 37–41. https://doi.org/10.1080/00140139.2013.820843