Such are the issues that two psychologists with theological training and ministerial ordination draw from social science literature as it relates to religious conversion. Few, if any, of these issues are settled definitively. There is a great need for solid, responsible research, not to prove or disprove, but simply to understand, predict, and, where desirable, control. For these are the goals of science. Before research can be productive, however, these are the goals of science. Before research can be productive, however, there is need for theoretical development. Inadequate conceptualization, especially of necessary distinctions and discriminations, has handicapped the scientific investigation of religion almost as much as a limited tool kit. But the signs of the times regarding social scientific investigation of conversion are hopeful. Especially to be recommended for further research by someone well acquainted with the field of religious conversion is the vast literature in social psychology on opinions, attitudes, and beliefs. Perhaps we can continue the process of knowledge-building that began so promisingly in the first three decades of the century and then stopped on a plateau.