The document outlines a research study by Toshihiko Yamakami aimed at developing a dimensional model for service design using public transportation open data to enhance third-party applications. It discusses the challenges of utilizing open data, presents examples of applications in Tokyo, and proposes a framework for service design that can be adapted for various open data domains. The study concludes that while there is a growing availability of open data, there is a need for structured methodologies to effectively leverage this data for improved transportation services.