This document is a master's project that examines public participation in the planning and design of sustainable public open spaces. It introduces the scope, definitions, claims, and rationale for the project. The introduction defines key terms like participation, design, sustainability, and open space. It claims that landscape architects need to understand different levels of participation to create flexible and sustainable designs, and that more active participation can lead to more creative and sustainable outcomes. The rationale discusses the philosophical need for systematic inquiry in landscape architecture and the operational need for an evaluative framework to guide participatory processes.