TY JOUR TI Prospects of Polytechnic Principle of Learning in Technological Training of Pupils of 5-7 Grades KW polytechnic principle of learning KW polytechnic education, technological training KW project method. JO Scientific Research and Development. Socio-Humanitarian Research and Technology AU Terentyev, S.. PY 2014 IS 3 PB INFRA-M Academic Publishing LLC.