9.1.2.1: Maybe people accept unclear agreements because they think they can sense what is meant and they will act accordingly. It might still be wise to check this. Another reason for vagueness could be that this provides individual freedom to deviate. If this aspect of organisational culture is strong, then even hard-boiled agreements will show hairline cracks used to wriggle oneself out of them.

Look at solution 8: changing the organisational culture. Read organisations 1: structure of organisations (professional organisation).