The teacher starts the lesson with a problem. On the basis of previous knowledge of the learners, they think about the possible solutions to the problem. After it, learners try to find out which hypothesis could be the best solution for this problem. To find out the best solution, the learners do interaction/discussion (learner-learner interaction and teacher-learner interaction), self-study, and experiment(s). Learners test their hypotheses one by one and finally arrive at the best possible solution to the problem. This approach can be best identified as