摘要：Learning to teach is a complex process that has to be addressed from a holistic viewpoint,that taking into account different interrelated components: cognitive,didactic,technical and affective.In this paper,we report the development of tasks to promote the mathematics teacher self-identity in mathematical learning,within the context of teachers'professional development in mathematics.A set of design heuristics for educative materials are presented to enhance the overall design of this kind of materials.A description is given of some examples of materials developed and used in the classroom with prospective teachers and teachers in-service.The research strategy is framed inside a Design- Based Research (DBR).
