The term "Big Project" is an umbrella term that refers to a large, complex and ambitious undertaking or task. It usually implies a significant investment in time, resources, and effort, with high stakes involved. The scope and complexity of the Big Project can vary greatly depending on the context - it could be a major construction project, an extensive research study, a multi-phase business initiative, or any other large scale endeavor that requires planning, coordination, and execution across multiple teams, departments, or organizations.