This document explores the factors and causes of project success and failure. It discusses the criteria for project success, such as the right team, effective planning, communication, risk management, and project closure. It also examines the causes of project failure, including poor planning, inadequate documentation, lack of experience, leadership, and communication, inaccurate budget estimations, and lack of contingency plans. Two case studies, the Accenture-Hertz lawsuit and the Optus Stadium project success, provide real-world examples.