Comprehensive and Detailed Explanation From Exact Extract (CSI-based)
In CSI’s description of the facility life cycle, the last phase is decommissioning. This phase occurs when a facility is taken out of service because it is no longer needed for its original operations, has reached the end of its useful life, or is being prepared for conversion to a different use. The emphasis is on the facility no longer being required for its intended operations, not strictly on demolition or permanent abandonment.
Decommissioning tasks can include: removing or securing systems, handling hazardous materials, salvaging components, planning for demolition, or preparing the facility for a different use.
Because decommissioning can precede demolition, adaptive reuse, or other end-of-life actions, it is triggered when the facility is no longer needed for operations.
Option B captures this definition accurately.
Options A and C are too narrow: demolition or permanent disuse are possible outcomes of decommissioning but not the only reasons it is required. Option D (change of ownership) does not automatically require decommissioning; a facility can continue operating normally under a new owner.
Relevant CSI references (no links):
CSI Project Delivery Practice Guide – Facility Life Cycle chapter (discussion of operations, maintenance, and decommissioning).
CSI CDT Body of Knowledge – overview of project phases including decommissioning.
