This bachelor thesis focuses on identifying the main external factors that influence the quantity and diversity of playful behavior of children. The thesis deals with active, outdoor, spontaneous, motional and interactive game, both in individual and social form, i.e. play between children and between children and adults. The work provides an overview of the physical, social and parental views on the children's play on the number of children's outdoor games. It is also possible to link the motivation of a child to a free outdoor game with selected external factors. Last but not least the work demonstrates the methods used to measure these three factors. The research proposal is derived from the findings in the first part of the thesis and s...