In this poster we present a framework of the elements of co-design sessions with children. The involvement of children in the design process is important in order to understand their needs but it is often considered a complex practice. Considering a thorough appreciation of this practice as the basis for its accurate application, we addressed its complexity in a framework. To do so, we identified and organised elements that have an impact on co-design sessions in who, where, when, what and how dimensions. This theoretical framework aims to support novice practitioners in their decisions when coordinating co-design sessions.