According to the service unit, promise some non-engineering problems, or the situation in the later stage of the project, extra concessions and so on.

For example, if you work in a residential area, you promise not to disturb the people, produce garbage, make noise, and do not happen. How to deal with it?

It's like a notice to the people. Wait a minute.

If it is a road, it needs not to affect the traffic, set up standard signs and so on.

In general, this commitment is made at the request of Party A..