This article provides an overview of recent interest research, focusing on the conceptualization, measurement, and generation of interest. It includes work that reflects differing theoretical backgrounds, research traditions, domains, and participants. Research on interest needs to be theoretically grounded if it is to be generally applicable and inform practice. Investigators must consider their own research questions, including learners' age and characteristics of the learning context, in relation to the range of conceptualizations in the field. Whereas researchers' questions should drive research on interest, their conceptualization of interest should inform their choice of measures. In addition, research addressing the ways in which interest might be generated and/or supported to develop should be aligned with both the conceptualization and measurement(s) of interest. (Contains 2 footnotes.)