Projects have a beginning, progress and some sort of end. Code 17 focuses on the progress of a project.
There are standard situations which can quickly be described by a code. More complex situations are treated in the usual way with verbal descriptions.

The precision of the code establishes the situation quickly and without ambiguity. Just as we recognize anything else that has a name, so we can also recognize project-status situations.

The code covers both inquiries and responses.

The code is concerned with the status of the project at the time of the inquiry.