Gathering evidence on the outcomes of any professional learning experience can be a challenging and complicated task. It involves consideration of a wide variety of perceptual and contextual issues, some obvious to education leaders and others not. Those who want to succeed in this process may find the following points helpful: (1) Always begin with the outcomes; (2) Different stakeholders trust different evidence; (3) Use multiple sources of evidence; (4) How evidence is gathered is just as important as the evidence itself; and (5) Plan for comparisons.