Most project managers are trained in WBS and PMI has been promoting work breakdown structure as the primary task management tool for years. Traditional project management uses work breakdown structure or WBS. The tasks at the end of each branch are called leaf tasks. This process is continued until the final subtasks are small enough to be worked on and finished in just hours or days. This is done by breaking the large tasks into smaller tasks (called subtasks) and breaking the smaller tasks further into yet smaller tasks. Work breakdown structure is the discipline of breaking down and simplifying tasks such that the resulting tasks are well defined and understood.
