A system, a method and a computer program product for managing activities in project management. The system includes an activity sensor for collecting activity data from user inputs and event logs; a model builder for creating a project model by integrating said activity data with project tasks; and a central repository for storing the project model created by said model builder. The method includes steps for collecting activity data from user inputs and event logs; creating a project model by integrating said activity data with project tasks; and storing the created project model. Accordingly, the project manager can track various activities that occurred during the project and team members can share information and knowledge.