The results are presented of the intervention and assessment process of a recently designed parent's training program, called "Family Co-responsibility (COFAMI): How to promote children's cooperation and responsibility" (Maganto & Bartau, 2004). The COFAMI educational program falls within the framework of the more extensive programs of social sensitization that are currently being promoted in the European Community to achieve equality between men and women and to promote the adequate coordination of professional and family life in the countries that belong to it. The aims of COFAMI are to contribute to the incorporation and strengthening of distributional patterns and intergenerational agreement of parents and their children about the activities that make up family life and to influence the improvement of relationships and collaboration within the family. It is a parents' group training program aimed at developing their educational skills to achieve their children's collaboration in family life and to develop their responsibility, setting the foundations so that in future generations, an egalitarian style of men's and women's family life will be practiced. We herewith present the educational intervention procedure carried out with the COFAMI program in 8 groups of parents (N=178 subjects, 143 women and 35 men) from several municipalities of the Basque Country (Spain). The number of components in each group ranged between 9 and 23. Each group was directed by a monitor who was previously trained in dynamyzing the COFAMI program with this type of groups. A longitudinal and quasi-experimental design with a nonequivalent comparison group was employed, following the pretest-implementation-posttest phases. An initial assessment of the process as well as of the results was performed in order to assess the COFAMI program and its impact at the family, school-municipal, and social levels.The main conclusions of the assessment and educational intervention carried out with the COFAMI program in the Basque Country can be synthesized in two aspects: 1) It has had relevant impact on the participant mothers and fathers, on their descendents, and on their families, and also at the school/municipal and social levels. In accordance with the theoretical assumptions that support this work, the complementarity and interrelation of changes in the various areas assessed should not be forgotten. These results are interpreted from an interactionist, dynamic, systemic, and ecologic viewpoint of the family. Continuous and dynamic feedback was revealed between the members that make up the family system, as well as with other external systems. The COFAMI training program establishes a group ambience and conditions that elicit certain changes in the participant mothers and fathers that, in turn, generate changes in their relations with their children and in their family life, both at perceptual and behavioral levels. And this contributed to the improvement of communication and relations with the involved institutions that collaborated with the intervention. 2. The program is useful for the achievement of the goals pursued; that is, to provide participant parents with educational strategies and resources to enhance their sons' and daughters' collaboration and responsibility concerning housework and family life. The results indicate that, in general, both the professional-monitors of the groups and the participants perceived its usefulness as an educational resource to educate children in co-responsibility. The COFAMI program is causing a relevant school-municipal and social impact in two senses: 1) to promote equality in family and social life, and 2) to promote group training of parents as an educational strategy for family and social change. Key words: family co-responsibility, group training of parents, family education(Note: This investigation was funded by the University of the Basque Country (1/UPV 00218.230-H-14852/2002) and by Emakunde- the Basque Women's' Institute.)