This article deals with providing support for the execution of pedagogical scenarios in Learning Management Systems. It takes an engineering point of view to identifies actors, design and use processes. Next it defines the necessary capabilities of a platform so that actors can manage or use pedagogical scenarios. The second part of the article is dedicated to the presentation of the design and properties of a component we have developed for the execution of scenarios: a flexible Workflow engine and a user interface providing indicators about the student progress within a unit of study. (Contains 11 figures.)