A business analyst (BA) is working on an initiative to decommission a legacy system and...

 The requirement ‘’Ability to view policies created in the legacy system for a period of 6 months’’ is a transition requirement. A transition requirement is a temporary requirement that specifies the capabilities or conditions that the solution must have or meet during the transition from the current state to the future state. Transition requirements are typically related to data conversion, training, migration, or decommissioning. In this case, the requirement is needed to ensure that the policies created in the legacy system are still accessible for a limited time after the system is decommissioned, until the new system is fully operational and stable. References:

CBAP / CCBA Certified Business Analysis Study Guide, 2nd Edition, Chapter 2: Business Analysis Key Concepts, Section 2.4: Requirements Classification Schema, p. 66-67

A Guide to the Business Analysis Body of Knowledge® (BABOK® Guide), Version 3, Chapter 2: Business Analysis Key Concepts, Section 2.4: Requirements Classification Schema, p. 34-35