The effects of the redevelopment of an elementary school-yard were evaluated by comparing the situation before and after the physical transformation. Observations produced data on the actual use during playtime. Interviews were held with all the pupils on their perception and evaluation of the change. A group of adult experts judged the environment before and after the change on aspects like complexity, manipulabtli€y and affordances for different activities. An interview with the designer of the plan gave information about his intentions and expectations, especially concerning behavioral aspects. Data from these different sources are presented and related to each other.