Helping Teachers Generate Exercises with Random Coefficients

International audienceFirst, we propose two taxonomies concerning software designed for teaching mathematics, which we call Technology Enhanced Learning (TEL) environments, the first one concerns the teacher's place and role in TEL environments, the second one concerns the activities which are foreseen and provided by TEL environments. Second, we consider TEL environments which provide teachers with tools for building patterns of exercises used in the TEL environment to generate randomly and dynamically exercises or lists of exercises. Our approach is compared to classical approaches (based on standards like IMS-QTI or on Computer Algebra Systems)