This document provides justifications for the approaches used in a research project to develop an e-menu prototype for a Thai restaurant. It discusses: 1) The relationship between research objectives, approaches, and outcomes using a case study methodology. 2) The justification for using a case study methodology, RAD software development, direct observation for requirements gathering, and group interviews for data collection. Reasons included enabling an in-depth understanding of business needs and processes. 3) The document concludes the approaches allowed for a deep understanding of requirements but were time-consuming, requiring an action plan for effective time management.