In the Business Analysis Core Concept Model (BACCM) , Change is defined as "the act of transformation in response to a need" . It is central to business analysis, as all efforts revolve around enabling or managing change that delivers value.
Exact Extract from BABOK Guide v3 - BACCM Core Concept: Change:
"Change is the act of transformation in response to a need. The purpose of change is to improve the performance of an enterprise."