It isn’t the changes that will do you in; it’s the transitions. They aren’t the same thing. Change is situational: the move to a new site, a new CEO replaces the founder, the reorganization of the roles on the team, and new technology. Transition, on the other hand, is psychological; it is a three-phase process that people go through as they internalize and come to terms with the details of the new situation that the change brings about.
William Bridges, Susan Bridges in Managing Transitions