This document summarizes research exploring the complexity of policy design for Bus Rapid Transit (BRT) systems. The research team from Instituto Superior Técnico, Universidade Técnica de Lisboa aims to understand BRT decision making processes, develop a framework for retrospective policy analysis, and create a systems dynamics model to identify effective policy packages. The document outlines preliminary analysis of Transantiago, Santiago's BRT system, including its objectives, issues with the prior system, key policy features, implementation challenges, and stakeholder analysis. It also presents an analytical framework and initial evaluation of Transantiago's policy package.