The purposes of this study are (1) to develop mathematics motivation measurement instrument, developed based on Self-Determination Theory, (2) to confirm component factors of the construct proposed by the SDT, and (3) to test the goodness of the developed measurement instrument. The results of the confirmatory factor analyses revealed that the 8-factor model with two items double-loaded in amotivation and external regulation factors and the 8-factor model without those double-loaded items had the best model fit indices. These models were recommended since they had best model fit indices and were consistent with the theoretical model proposed by Vallerand et. al(1992).
The Cronbach\'s alphas, reliability measures for the overall test and the component factors, were high enough to satisfy the requirement for the test as a measurement instrument for mathematics motivation. Also, the item discrimination indices, which were correlation coefficients between individual items and the overall scores, turned out to be appropriate for most items. Finally, the correlation between mathematics motivation inventory scores and
mathematics achievement test scores were also significant and higher than the correlation with between mathematics motivation scores and language or social studies achievement scores. These results confirmed the criterion-related validity of the mathematics motivation inventory developed by this study.