Modern society imposes special requirements to the formation of a system of personal value orientations, communicative competence, and interaction skills of younger students in primary school. The article reveals the problems of development of communicative competence of primary schoolchildren on the basis of competency-based approach. Communicative competence is considered as a holistic system of mental and behavioral characteristics of a person that contribute to successful communication, that is, achieving the goal (effective) and emotionally favorable (psychologically comfortable) for the parties involved. From the standpoint of dialogue and interaction, the leading socio-psychological needs and value orientations of primary schoolchildren are shown; their communicative difficulties are described. Technologies and criteria of efficiency of development of communicative competences are presented: paired and group work; tasks aimed at independent search and choice of solutions, the justification of opinions; problem communicative situations (cases); games; special communicative tasks, etc. The data of the study with the use of group activities aimed at creating an integrative learning environment in the classroom are presented. It is shown that in the experimental group, after specially organized classes with the performance of tasks in pairs and mini-groups, the indicators of mutual control, the ability to negotiate, increase the clarity of statements.