I have just finished reading a book from the 1980s about MRPII implementations, something I found on Ebay a couple of months ago (and something generally hard to come across to buy). One of the recurring themes in the book was about moving away from informal systems (and workarounds) towards making a formal system work.
I had to check the date of the book...
It's funny how the principles of production and logic are timeless, as are the ways in which people attempt to override them!
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