Problem solving 63 Study and teaching (Secondary) 22 Mathematics 21 Dissertations 15 Dissertations, Academic 15 Study and teaching 14 Mathematical ability 9 Testing 9 Ability testing 5 Critical thinking 5 Decision making 5 Group problem solving 5 Study and teaching (Primary) 5 Case studies 4 Data processing 4 Metacognition 4 Study and teaching (Higher) 4 Arithmetic 3 College students 3 Design 3 Physics 3 Teachers 3 Thought and thinking 3 Training of 3 Academic achievement 2 Attitudes 2 Computer-assisted instruction 2 Educational psychology 2 Geometry 2 Human information processing 2