Someone I know who did a lot of consulting said consulting was very easy 1. Go in and talk to employees about what is wrong 2. Tell management what the employees said without mentioning it came from the employees (so that management wouldn't dismiss it out of hand) 3. Charge a lot of money so management felt like it was very valuable feedback
Also repeat the entire exercise every year so the company can iterate and circle back on the issues regularly.
4. Fix a few glitches so cost can be justified.