Lack of a comprehensive training program. Training makes CAD users more than mere CAD operators. It enables them to use the software to its fullest potential for streamlining and improving design.

No modeling standards. Without them, model construction can be ill-planned and result in models that are difficult or impossible to fix.

No backup. Expecting designers to catch their own mistakes is risky. They probably won't.

Unclear lines of supervisory authority. Having a variety of supervisors overseeing designers' work can lead to inconsistent directions and confusion.

Modeling parts more than once. One of the chief advantages of CAD is that you don't have to model anything twice. If you're going to consistently re-model, go back to the board.

Lack of productivity standards. Failure to set standards on timeliness, for example, takes away a sense of urgency and can result in late work.