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Book compares the progression from craftsmanship (by hand and custom manufacturing) with mass production and lean production. The authors had surveys and contact with car manufacturers and summarized the results in the book. As you'd assume, craftsmanship has the slowest production rate and highest errors, whereas lean production had a better production rate with the least errors and mass production, according to the numbers, seemed to have a higher production rate with a moderate amount of errors. The production types also had implications for employee advancement and morale, where lean production allowed workers to constantly think about improvements as opposed to just doing only your assigned task. There are a lot of details in the book and it was a bit overwhelming to the point of sounding repetitive. Good book for anyone interested in improving a process or production. Although it's geared toward mechanical products (cars), many concepts could apply to any process.