In this paper, we address the problem of competency comparison, providing some heuristics to help match the competencies of users with those involved in task-based scenario components (actors, tasks, resources). Competencies are defined according to a structured competency model based on a domain ontology. We provide a context for recommendation through a learning scenario model. The approach has been implemented by extending an ontologydriven system called TELOS. It has been tested with a learning unit where these comparison relations are used to provide recommendations to users involved in a technology enhanced learning scenario.