Psychology researchers have long attempted to identify educational practices that improve student learning. However, experimental research on these practices is often conducted in laboratory contexts or in a single course, which threatens the external validity of the results. In this article, we establish an experimental paradigm for evaluating the benefits of recommended practices across a variety of authentic educational contexts—a model we call ManyClasses. The core feature is that researchers examine the same research question and measure the same experimental effect across many classes spanning a range of topics, institutions, teacher implementations, and student populations. We report the first ManyClasses study, in which we examined how the timing of feedback on class assignments, either immediate or delayed by a few days, affected subsequent performance on class assessments. Across 38 classes, the overall estimate for the effect of feedback timing was 0.002 (95% highest density interval = [−0.05, 0.05]), which indicates that there was no effect of immediate feedback compared with delayed feedback on student learning that generalizes across classes. Furthermore, there were no credibly nonzero effects for 40 preregistered moderators related to class-level and student-level characteristics. Yet our results provide hints that in certain kinds of classes, which were undersampled in the current study, there may be modest advantages for delayed feedback. More broadly, these findings provide insights regarding the feasibility of conducting within-class randomized experiments across a range of naturally occurring learning environments.

Despite the growth of team-based design projects in first-year engineering courses, more research is needed into student attitudes toward teamwork and the characteristics of team experiences that lead to improvements in student attitudes toward working in teams. This study is an exploratory investigation of student attitudes toward teamwork at three time points during a first-year project-based, team-based design course: before students have begun working in teams, after they have completed an initial small-scale design project in a 4-or 5-person team, and after they have completed a larger-scale design project with a different, similarly-sized team. The general classroom approach on teaching teamwork is discussed with details on the variety of teaching methods used to engage students in learning and practicing good teaming skills. The quantitative and qualitative results from the survey are discussed, and conclusions drawn as regards students' perceived fun, frustration, and learning to understand what factors influence students' perceptions of these three aspects of teamwork.

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James Coller is an engineering graduate student at the University of Michigan where he also completed his B.S. in Naval Architecture and Marine Engineering in 2017. He spent three years during his undergraduate education as an Instructional Assistant for a first year engineering course. His research interests include autonomous robotics for both land and marine environments as well as naval ship design problems. Mr. Magel Su, University of MichiganMagel Su is a current undergraduate student at the University of Michigan studying materials science and engineering with a minor in chemistry. He is also a member of the engineering honors program, an instructor for a first-year engineering design course, and a researcher in the Yalisove Lab Group. Assessment of Peer Mentoring of Teams in a First Year Design-Build-TestCommunicate Class AbstractPeer mentoring has been associated with beneficial outcomes in higher education, from increased retention of minority students [1] and women [2] to learning gains for both mentors and mentees [3] . Most of the peer mentoring relationships investigated in the literature are of mentors not tied to a specific course [e.g., 2 ]. This paper reports on how one section of a first year, intensive, projectbased learning class uses peer mentors to guide student teams throughout a design-build-test project in a first year engineering course.Our one-semester course is a four-credit combined technical and communication course. Students work in teams of four or five students to design, build, and test two underwater vessels (one an unpowered bathysphere, one a remotely operated vehicle [ROV]), as well as to report on those designs. Former students of the course participate as peer mentors, working directly with a single team to guide design decisions and provide feedback on all facets of the design and communication process.In Fall 2016, we conducted an assessment of our current peer mentoring system by surveying students and peer mentors. As all students in our section experience mentoring, we did not have a comparison group, but we did seek to understand the benefits and drawbacks of mentoring for both students and mentors. From this survey, as well as our experiences facilitating the course with peer mentors for eight semesters, we are able to report a few "best practices" for facilitating the peer mentoring experience in our context. Importantly, we find that both students and mentors benefit from the mentoring experience, enough to justify our efforts to manage it. We do note potential disadvantages of mentors, as well as possible ways to mediate these drawbacks. This report contains the results of the survey, as well as instructor conclusions on what aspects of the peer mentoring experience are most important for successful implementation.