TY JOUR TI Triangle of Knowledge “Extra-Day Educational Activity and Conditions of Its Realization in Education KW the triangle of knowledge KW extracurricular activities KW homework KW FSES KW functional literacy KW fundamental content KW a holistic worldview KW interdisciplinarity KW communication KW didactic barriers KW instrumental activity platforms KW strategic guidelines JO Standards and Monitoring in Education AU Nazarova, T.S. PY 2020 IS 8 PB INFRA-M Academic Publishing LLC.