The focus of this text is the didactic activities performed on the World Wide Web (Web). Its main objective is to introduce new possibilities to increase interactivity to the student with the content during courses supported by the Web. To do this, it will be presented the iAssign package, a free system to manage activities with interactivity in Moodle. It will be demonstrated the basic functionality of iAssign, initially from the point of view of the student and later from the teacher´s point of view. It will be show how to create activities with iAssign. Despite the fact that iAssign has several Interactive Learning Modules (iLM), the course will focus on a single topic, triangle centers, using the iGeom system. It will be presented some references to others iLM, like iVProg and iGraf, respectively, for teaching and learning introductory programming concepts and the study of functions.