informal communication can be used when talking to your friends or your family
Body language is communication through movements, hand gestures and body posture.
Game-based learning is a popular approach where the instrument for a learning process is a game. Game-based learning scenarios are often found online - they are often favored because they engage learners in a way that few other learning methods do.
A solution has already been found during a solution presentation. The only thing that remains is to find a solution on how to realize the decision.