I used to put a lot of stock in those guides, but there are so many other variables involved a guy can almost do as good of a job figuring it out himself.
A good variable example would be "layout". If you have two separate counters (front counter and back counter) that are on opposite sides of the parts department do you think that you can maintain the same counterman/customer ratio as the department that has everyone working across one counter? I know from experience that the single counter system is far more efficient than the dual counter system....especially if there's a good distance between front/rear counter. I understand why it's not popular, but you can do a whole lot more with less people that way.
Stuff like that makes you want to set fire to the NADA number when it doesn't pan out....lol. Especially if you work for someone with little imagination and lives by them.
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