1.1. Primary Structure
1.2. Interior Design
1.6. Site Of course, the WBS could have been organized a number of different ways, and can be represented graphically as well as by text, as above. If you're trying to organize a WBS to work with a cost estimate, organize it so that it makes the number easier to put together. As to books, the basic one is the A Guide to the Project Management Book of Knowledge (PMBOK Guide), published by the Project Management Institute. PMI also publishes a Practice Standard for Work Breakdown Structures, which has appendices that illustrate WBS examples for different industries. I have found most useful a book titled Work Breakdown Structures, the Foundation for Project Management Excellence, by Eric Norman, Shelley Brotherton, and Robert Fried. Wiley is the publisher of that book. I shamelessly copied the house example from this book, as it is simple and clearly illustrates the idea behind the WBS. As a sidenote, the WBS often has a WBS Dictionary with it, so that critical terms can be defined as they relate to the scope of the project. "Window washing systems" by itself is a little vague, but the WBS Dictionary can define that to mean the exact type of system selected. Think of it as a type of outline spec. Once you've broken down the project scope by means of a WBS, you can take the deliverables in the WBS to create a much more detailed Project Schedule, assign hours/cost to each task, and monitor each through project execution. That's part of Earned Value Management, but that's another whole topic for discussion.