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Abstract Despite the fact that most science learning takes place outside of school, little is known about how engagement in informal science learning (ISL) experiences affects learners’ knowledge, skill development, interest, or identities over long periods of time. Although substantial ISL research has documented short-term outcomes such as the learning that takes place during a science center visit, research suggests that the genuine benefits of informal experiences are long-term transformations in learners as they pursue a “cascade” of experiences subsequent to the initial educational event. However, a number of major methodological challenges have limited longitudinal research projects investigating the long-term effects of ISL experiences. In this paper we identify and address four key issues surrounding the critical but challenging area of how to study and measure the long-term effects or impacts of ISL experiences: attribution, attrition, data collection, and analytic approaches. Our objective is to provide guidance to ISL researchers wishing to engage in long-term investigations of learner outcomes and to begin a dialogue about how best to address the numerous challenges involved in this work. 

Supportive community contexts are critical to positive youth development. Out-of-school time (OST) programs serve as supportive community contexts, and participation in OST programs is associated with a host of positive outcomes for youth. Cultural centers, such as museums, have been identified as potentially supportive community contexts for youth. Still, museums have been mostly absent in the broader research discussion of the role of community-based OST programs in promoting positive youth development. The current article presents a qualitative, single-case study of 37 youth between the ages of 13 and 18, the majority of whom identified with racial/ethnic identity groups traditionally underrepresented in OST program participation, in which we examined youths’ perspectives of the features of a museum-based, science-focused, youth development program that they found to be particularly supportive. Five themes emerged, including (a) the program structure, (b) meaningful opportunities and experiences offered by the program, (c) relationships with staff, (d) a positive peer culture, and (e) sense of belonging. The results provide detailed insight into how cultural centers, such as museums, can serve as supportive community contexts for youth development.