The wisdom of tapping focus groups and creating a highly collaborative approach to building is right on point. However, even with speed to market, 4 years is a long time.
The team must work to maintain their synergy and the focus that served them at the project's beginning. Oftentimes, on an enterprise that takes years, changes occur and they can have an impact, both positive and negative, to the project. Understanding and managing human resource changes on a project can eliminate any potential dip in morale or in production.