With the increasing use of Learning Management Systems, people who use them have gotten new opportunities to access knowledge through the Internet. This has drawn attention of researchers from the Informatics and Education on several research issues. Among them is the strategy proposed in this paper, describing an approach that uses multi-agent system and competency-based learner model ontology focused on adaptation of the Moodle system to assist students who have doubts or errors when performing certain activities proposed by the teacher or who have low skills levels required to perform these activities. Such assistance is a personalized recommendation of students with an appropriate profile based on their skills and competencies to help students' weaknesses.