Focuses on two secondary students' beliefs and the relationships that emerge from the actions that take place in a classroom. Uses an interpretive approach with the two participating countries, Spain and Costa Rica. Reports that students construct their own theories regarding their role at school and learning and teaching mathematics. (Contains 22…

Analyzes students' main difficulties in learning the concept of electric field. Briefly describes the main conceptual profiles within which electric interactions can be interpreted and concludes that most students have difficulty using the idea of electric field. Contains 28 references. (DDR)