1. Nature of Involvement
   1. Passive
      1. Verbal Receiving
      2. Visual Receiving
   2. Active
      1. Receiving/Participating
      2. Doing
2. Recall After 2 Weeks
   1. Action
      1. Reading
         1. Listening
            1. Looking at Pictures
            2. Direct Observation
            3. Participating in discussions/Giving a Talk
            4. Doing a Presentation/Simulating/Performing the Task
   2. Retention @ 2 Weeks
      1. 10%
         1. 20%
            1. 30%
            2. 50%
            3. 70%
            4. 90%