@roger,
As a Controller for a retail business, I converted them into 13 4 week accounting period to keep track of sales and labor costs. It really helped during the holidays and Christmas sales season. I also converted them into a standard cost system and from a manual to computerized accounting. The owner had empty lots in Cupertino, so I advised him to convert that empty lot into a commercial building. Guess what? Apple was just starting, and they rented his property. After awhile, I was twiddling my thumbs, so I asked him if it would be okay if I put him on a fee basis rather than full time, and he said okay. That's when I started my consulting business, and made good $$$$ until my early retirement.