[Pilot evaluation of the «Transformem els patis» program in elementary schools in Barcelona].

Objective: To evaluate the "Transformem els patis" (Let's transform the schoolyards) program in Barcelona in terms of schoolyard use, social interaction, physical activity, and diverse forms of play with a gender perspective.

Method: A cross-sectional pilot evaluation study with mixed methodology involving eight primary schools (four in intervention group and four in control group). For the quantitative analysis, 16 systematic observations were performed in the schoolyards of both groups.