This document discusses simple classroom-based research techniques that teachers can use to evaluate what works in their lessons. It begins by defining several terms for classroom-based research such as participatory research, action learning, and teacher research. The document then explains that classroom-based research involves reflective teaching as well as systematically planning an intervention, observing its impact, reflecting on the results, and revising the approach. It provides examples of researching a classroom issue using this cyclical process and emphasizes the importance of collaboration and sharing results. In the latter half, it discusses using item analysis of student assessments to help evaluate teaching effectiveness.