1. Develop and test activities through multiple classroom iterations. Try it more than once! See if the same outcome occurs. See if some minor alternations make it even more effective.
2. Collect evidence from multiple sources, such as students and outside observers. Yes, your opinion as to whether and how well something worked counts, but verify what you think happened by collecting information from students. They don’t always experience things the way we think they do. Ask a colleague or a professional from the teaching center to come to class and observe and report what results they’re seeing.
3. Collect evidence using multiple methods. Most of us don’t evaluate what students know by only using multiple-choice methods. So our instructional alternations ought to be assessed with multiple methods—qualitative, quantitative, descriptive, and so on.
4. Tie evidence to learning objectives. Why did you try the new activity? Is it an attempt to better reach one of your learning objectives for the course? Usually changes are, which makes it natural to judge their effectiveness by looking at evidence documenting how well they accomplish the learning objective.