The first publication of “Stages of Religious Judgement” dates back two decades. This, then, is an appropriate time to review major milestones reached since, and to attempt a look into the future. The reception of Oser's writings on psychology of religion and religious education in the English, French, and German literature was reported previously. We assume here that RJ theory is familiar. The present three parts are: A. Empirical studies, B. Cognitive development and religious stages, and C. Conclusions.