The objective of this research was to determine the validity of Students’ Mathematical Process Rubric (ProM3) using Many-Facet Rasch Model (MFRM). The data were gathered from 7 raters marking 188 scripts of Form 1 students from a number of boarding schools in the middle and northern zone of Malaysia. ProM3 Rubric was used to analyse students’ responses in problem solving and reflective writing tasks for 29 criteria, that is in five dimensions of the mathematical process, namely connection, representation, communication, reasoning and problem solving. MFRM was used to analyse the data to look into three facets; student ability, rater severity and item difficulty. The findings indicated that the accurate index measuring students’ ability facet was between -3.48 until 4.71 logit, raters’ severity facet between -0.59 until 0.74 logit, and items/criteria’s difficulty facet at -2.38 (problem identifying) until 1.45 (quantitative reasoning) logit. The high validity and reliability c.....

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