When a client or supervisor dictates how a program should process well-formed input data, take the opportunity to agree in detail on how the program should act in case of error.

James Bradburne, the director-general of the Strozzi and the supervisor of its shows, has a gift for making the process of looking at art both enjoyable and educational.

The phrase “must be authorised by the supervisor” simply means that the process that implements this capability (Amend Order With Authorization, in the example) is dynamically invoked.