We explore the idea of integrated physically based manipulation and decision-making tree for navigation to support design rationale. It introduces a way to support user participation. This paper also proposes and validates a framework which combines several techniques to aid user to make decisions. We hope this research can assist untrained users to quickly feel comfortable and satisfied for a computer aid system by rational way. This paper focuses on a system prototype for the client customization process in apartment plan design
to exemplify our concepts.