Agree with all that has been said and would add the importance of acknowledging the impact that change has on employees. Dealing with the implications of the change itself can be incredibly distracting for folks- making it difficult for them to move forward and get behind any new mission, vision, plan, etc.
Equipping leaders with a common language and understanding of how change impacts people is helpful so that they can work to help employees get what they need to separate fact from fear- and move from resistance to acceptance to a growth mindset. The Change Cycle is one of many models that can be helpful.
