The present paper is the result of an investigation on cooperative learning towards moral development among students of 3rd B.U.P. (16 year olds, final course of secondary schooling in Spain). The need to overcome a too restrictive moral education, often limited to the technique of moral dilemma is justified. Techniques used in the applied pedagogical programme are described (jigsaw and investigation group), as well as their rationale. The results obtained indicate a considerable increase in moral development for the experimental group. The main conclusion of this investigation makes it clear that it is possible to promote moral development by applying cooperative learning only without the recourse to moral dilemma (hypothetical or real).