As any project manager or scheduler will tell you, Primavera P6 is a great tool for project planning and execution. P6 is designed to allow you to manage cost, schedule, and resource information in as much detail as you want. It allows you to know where you are on a project and what is coming up, potential issues, what absolutely must be done on time to prevent project delivery from being delayed, and so on. This is all tactical information and P6 has an outstanding feature set to help manage it.
The same information in P6 that has such tactical value can also have huge strategic value. The detailed schedule documents, not only when certain work will be done, but when specific resources such as labour, equipment, materials, and money will be required. Summarizing this time-distributed resource information to the project level or higher provides a big picture view of the project's projected resource and spend profiles over time.