Many e-learning applications and games have been studied to identify the common interaction models of constructivist learning namely- 1. Move the object to appropriate location 2. Place objects in appropriate order and location(s) 3. Click to identify 4. Change the variable factors to observe the effects 5. System personification and dialogue with learner. The paper also presents around 14 qualitative aspects, which can serve as heuristics for evaluation of constructivist e-learning. The common interaction models and qualitative aspects are defined to help in improving the effectiveness and usability of constructivist e-learning.