This article is designed to present an overview of critical theory, research, and evaluation for the developmental mathematics educator. Students caught in the gap between high school mathematics preparation and entry-level college mathematics expectations--developmental mathematics education students--need to have their personal narratives told and have the measures of success reflect their needs. Highlights of evaluation theory and research, as well as a combination of qualitative and quantitative methods are presented for the developmental mathematics classroom researcher. There is an ongoing need for practical information on the effectiveness of programs and services addressing the mathematics educational gap. Hopefully this article will help you define your role in advancing this important evaluation and research area.