The real project benefits seem to bee less or greater than expected in the project plan.

Version 3 of ITIL was released in spring of 2007 and differs from Version 2 in its approach. Where Version 2 focuses on aligning business units with the IT organization using technology-oriented processes, Version 3 has a much stronger business focus and promotes IT integration into the business units. ITIL 4 has managerial approach in it.

ITIL, formerly known as the Information Technology Infrastructure Library, is the world’s most popular framework for IT service management (ITSM). Used across virtually every industry from technology to animation, ITIL is designed to help users align their IT services and business requirements, creating an atmosphere of continual service improvement that will ensure they can deliver the best end-products and services possible.

Integrated Master Plan (IMP) is an event-based, top level plan, consisting of a hierarchy of program events. It provides assistance in the scheduling of work efforts in complex materiel acquisitions.

What is the difference between traditional project management and extreme project management?

According to Ovidius, Pygmallion was a Cypriot sculptor, who fell in love with an ivory woman statue he carved. The goddess Aphrodite appreciated his love and offerings and changed the statue to a real woman. Pygmallion then married her and they had a daughter. So much for the history or mythology, now let's go back to management. The phenomenon called Pygmalion effect says that others' expectations from a person are affecting that person's performance.