Projects that change an organization demand that the project group build a substantial understanding of that the business is, what it could be, and how the project can help the business get there. That understanding needs to stay withing the organization after the project is officially complete. There is a vast difference between the understanding that comes from seeing a presentation on a project and the understanding that comes from actually doing the work.
Projects that are important to the company need to be living, evolving things and that means that the detailed understanding of the project needs to stay accessible to the organization. With LTV, as soon as it came out people wanted additional work and we could do it because we knew the nuts and bolts.