METHOD
In this paper, first, some of the available studies on IBL and PBL have been reviewed and debated. Secondly, the comparison of the methods has followed through in terms of the following aspects which are the criteria of the crosscheck of the study: the origin, principle, role of prior knowledge, starting to instruction, need for problem solving skills, explanation source, characteristics of problem, group learning, teacher role, student role, view on education, outcomes, appropriate grade level and field of application.