| Following is Carol Ptak's foreword to the new second edition to Quantum Leap by Dean Gilliam. The first edition, by John Costanza, was a foundation of early Demand Flow theory and one of the most influential manufacturing books ever written.
The world of manufacturing today bears little resemblance to the world of 30 years ago when I first walked onto a shop floor as an assembler. In those days, labor made up at least one-third of the cost of goods; inventory was considered an asset in both accounting and real terms; and time was measured in weeks and months. APICS, the Educational Society for Resource Management, was conducting a material-requirements planning (MRP) crusade.
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