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Science fairs have been around for decades, yet their critics question the extent to which parent involvement shapes students' investigations and creates inequitable experiences. Parent involvement in the science fair has been viewed as objectionable by parents themselves. However, research has shown that parent support can play a vital role in student learning. This article describes the results of research that explored the role of parents in middle school science fairs. Data from parent surveys and interviews, teacher interviews, and student focus groups were gathered from 21 schools across the U.S. (prepandemic) to examine patterns in parents' involvement in science fairs, including the roles parents play and whether involvement varied by parental characteristics. Findings show that parents' income and education affected their level and type of involvement, as did certain features of the science fair itself. Our findings have important implications for the structures of and equity in school-based science fairs.

Science fairs have a long history in the United States and internationally. Their implementation varies greatly (Kook et al, 2020), yet few empirical studies have examined the outcomes of these experiences for student learning. Research indicates that authentic scientific inquiry that focus on students' agency in investigations can contribute to students learning (e.g., Houseal, Abd-El-Khalick, and Destefano, 2014). However, teachers have been challenged with implementing inquiry-based investigations (e.g., Anderson, 2007; Harris & Rooks, 2010). As new science standards increase the demand for science investigations in classrooms that afford students opportunities to engage with science and engineering practices (SEPs; NGSS Lead States, 2013), research is needed to understand the role of teachers and how these experiences can contribute to student learning. In this article, we describe the results of a national study that included data from 21 middle school science fairs. Data included observations of 20 science fairs, pre and postscience fair assessment data from 343 sixth grade students, and interviews or focus groups with 131 students, 122 teachers, 16 administrators, and 29 science fair judges. These data enabled the exploration of features of science fairs, including opportunities for students to engage in SEPs and the teachers support for SEPs through the science fair investigations. Findings reveal that science fair implementation varies considerably across schools. HLM analysis indicates that teachers' support for critiquing practices, particularly when it included students' engagement in evaluating the work of their peers, are positively associated with students understandings of SEPs. Qualitative findings highlight the ways in which teachers structured students' experiences and supported their enactment of SEPs as they conducted their science fair investigations.