The purpose of reengineering is to "make all your processes the best-in-class. Managers could discover the best processes for performing work and reengineer them to optimize productivity. PAA echoes the classical belief that there is one best way to conduct tasks.
Re-engineering is concerned with what work requires to be done rather than how the organization is structured. The structure should suit the organization. Re-engineering focuses on eliminating unnecessary work and doing the work on hand more effectively.