At $work, r&d once had a retreat with a consultant to discuss why our productivity was too low per some spreadsheet. The consultant was told how everyone is in meetings all day so we all stole time from our families at night to get any work done at all. :(
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.