The article characterizes interaction areas of school psychologists and teachers when implementing creative project-based activities. The emphasis is placed on the need of training educational psychologists to be experts in characterizing the ways teaching, focused on the achievements of the modern educational psychology, is organized. There are presented the kinds of cooperation at all stages of the project-based strategy, focused on the support of teachers as active participants of programming and scenario planning of educational and bringing-up situations, responding to the principles of developmental teaching.