Background: Nature, definitions and theories of play in humanistic sciences is known with psychologocal origin. Among medicine and rehabilitation sciences, occupational therapy is the only profession that deals with a particular focus on play.

Conclusion: In this paper, the role of play in pediatric occupational therapy is discussed and the exsicting model is explained. Overall, the viewpoint of this model is congruent with exsicting definitions about play in psychology. It proposes that the special criterias are necessary to name an activity as a play; we can not name every structural  training exercise as the play.