Assessment in 2nd and foreign language learning has often centered on proficiency, although motivation has been shown to be critical in learning in general, as well as in 2nd and foreign language acquisition specifically. One of the issues relevant to the assessment of motivational processes in this area is that of cultural differences. In much of the existing work, motivational processes and constructs are assumed to be invariant across cultural and linguistic groups. This may be due to limitations in the existing models or in the narrowness of populations sampled. The purpose of this study was to test the robustness of motivational processes in language acquisition across different ethnic subgroups for the purpose of informing efforts to create more valid and sensitive measures. Participants in the study completed a background information survey, a motivation information questionnaire, and a learning outcome questionnaire. Factor analysis yielded 7 factors, and comparative analyses confirmed the importance of cultural and subgroup differences regarding motivational beliefs and suggested the importance of intragroup heterogeneity in future research and theory development. The implications for the development of broader assessment approaches are discussed. Assessment has long been an issue in the area of second and foreign language learning. Although there is not total agreement about the relevant dimensions to examine, the focus has overwhelming been on aspects of proficiency. Increasingly, investigators are looking at the cognitive correlates (Chiang, 2003) of proficiency or at alternative means of assessment (Sepassi, 2003). At the same time, relatively little attention has been paid to the affective or motivational aspects of the language EDUCATIONAL ASSESSMENT, 10(3), 209-229 acquisition process in assessment work to date, in spite of the fact that in the field of second and foreign language learning, motivation is increasingly seen as an important contributor to language proficiency. Similar to work on motivation in other learning domains, language learning motivation has been defined as the target language learner's orientation with regard to the goal of learning a second or foreign language (Crookes & Schmidt, 1991;Gan, 2004;Norris-Holt, 2001). Many second and foreign language learning researchers have emphasized that motivation is one of the main factors in target language learning success and it plays an important role in predicting the success of target language acquisition in general. Students with greater second/foreign language learning motivation, in most cases, receive higher grades and achieve better proficiency in the target language (Baker