No project is complete without the dreaded plan! In this chapter we explore how data warehouse projects are different from traditional development projects. This explains why organizations become unstuck when trying to use traditional “hard systems” approaches alone. They need to be augmented by a “soft systems” approach. Also, a complete work breakdown structure (WBS) for the design and development of data warehouse increments is given. The WBS contains more than 100 elements to be covered for each increment.