awatif abdelhamed. "A proposed program in scientific education using cooperative learning method and some scientific activities, and measuring its effectiveness in acquiring some scientific concepts and developing some social skills among kindergarten children (second level)". المجلة التربوية لکلية التربية بسوهاج, 24, 24, 2008, 221-278. doi: 10.21608/edusohag.2008.129545