ちなみに英語圏では"Project Management Triangle"とも呼ばれ こんな感じで説明されますね The balance between quality, time, and cost is a primary objective in project management. These three elements, as suggested by the triangle model, are tightly knit and mutually dependent. Alter one, and the others are affected. For instance, if your project timeline is stringent, it typically implies additional cost and potentially, a risk to quality. Similarly, if you desire high quality, it might require more time or come with a higher cost. The significance of achieving this balance cannot be emphasized enough since it often determines a project’s success or failure.