2.1.2 How a force-field diagram can help
The diagram is a useful expositional or presentational device. When you are presenting an analysis or proposal, the diagram will enable you to describe (and distinguish between) the reasons for a change. It will enable you to do the same for the reasons why a change may be resisted.
The diagram will be an explicit prompt for exploring the restraining forces. The more a manager finds out about these, and the earlier, the better placed the manager will be to find a way to deal with them. The idea of the restraining forces reminds a manager to look for and identify them.