]> relates to the individual objectives of the actor involved in a process. DEF: The Activity requires the use of Lessons learnt in order to be performed. This concept links the Lessons learnt model to the Process/Activity model. Activity Activite Environment Environnement refers to the context or situation. the knowledge gained or produced as a result to the Activity of CoP members. Lessons learnt Lessons apprises Negative lessons learnt Lessons apprises negatives subclass of the Lesson learnt class, they relate to the bad practices of the CoP, the actions or decisions to avoid. Positive lessons learnt Lessons apprises positives subclass of the Lesson learnt class, they relate to the good practices of the CoP, they determine the decisions or actions that are recommended. Problem Probleme represents a critical point or issue to be analyzed. DEF:it's the reason for being of the Lessons learnt. It describes, in the context of an activity or practice, a problematic or critical point whose related solutions are analyzed so as to determine the best way to find an issue on it. a solution to a Problem or a clue to solve it. Proposed solution Solution proposee the different types of knowledge resources used or produced in the CoP. Resource Ressource Feedback Reaction return on experience, opinion or assessment based on some criteria. Behaviour Comportement is a kind of Resource (subclass), it particularly represents the behavioural characteristics of a member in a group, his social interactions among the others, etc. Knowledge Connaissance theorique is a kind of Resource (subclass), it particularly represents the theoretical knowledge (procedural or declarative). Skills Capacites a kind of Resource (subclass), they particularly relate to the individual capabilities to do something. the role played by an actor involved in a process. Role Role Expert Expert a kind of Role (subclass), it represents the situation where a member is considered as Expert, assigning him particular tasks in some processes of the CoP. DEF: in the context of Lessons learnt, the Expert assesses the proposed solutions, using his expertise and taking into account the feedbacks of the Testers. Provider Fournisseur a kind of Role (subclass), where a member furnishes something during a particular process. a kind of Role (subclass), where a member receives something during a process of the CoP. Recipient Receveur/Destinataire a kind of Role (subclass), where a member tests something during a CoP process and gives his results. DEF: in the context of Lessons learnt, the Tester experiments the proposed solutions to a problem and gives his feedback. Tester Testeur le Feedback concernant une solution propos\'e9e permet de la corriger, de l'affiner. adjusts ajuste can be composed of peut se composer de describes the relation between two concepts, among which one can, in the context of the CoP, be a part of the other. can be composed of peut se composer de describes the relation between two concepts, among which one can, in the context of the CoP, be a part of the other. the Lessons learnt are a synthetisis or a formalization of the Proposed solutions to the Problem. formalizes formalise identifies identifie/definit when someone identifies something. is involved in est impliquee dans where the realisation of something implies the realisation of something else. is related to est lie a/concerne describes a link between two concepts. provides fournit describes the situation where someone furnishes something. tests/experiments teste/experimente describes the situation where someone experiments something. validates valide describes the situation where someone validates something.