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; and 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.