In one sentence
A clear picture of who a change will affect, how much, and what they will need to get through it.
What it means
A change impact assessment moves from "this project will change things" to specifics: which groups are affected, what is different for them, how significant it is, and what support they need.
What it looks at
Processes
What steps will be different?
Roles
Whose responsibilities will change?
Technology
What tools will people need to learn?
Culture
What habits and beliefs are being challenged?
Why it matters
Most change efforts depend on people doing their work differently. Knowing the impact allows you to plan training, communications, and timing around actual needs rather than assumptions.
A simple example
Illustrative scenarioA new scheduling system appears to be a small IT upgrade. The assessment shows that it changes how rural clinics share staff, so the rollout adds local planning sessions and a longer transition.
A common misunderstanding
What people often thinkSending an announcement and offering training covers change management.
What is closer to the truthThose are two tools. An impact assessment tells you whether they are the right ones, and for whom.