Demings was a genius of simplicity. He revolutionised process engineering and spawned the industry of consulting to management.
Tom Peters in the 80's made millions by taking his principles and selling them best. This model is still the best and being whole and perfect, can never be improved;
1. Customer Focus
2. Total Involvement
5. Continuous Improvement
The last one, known as Kaizen in Japan was instrumental in changing the process of manufacturing. In the book The Machine that Changed the World, the famous example was Ford's visit to Toyoda city in the 60's. Ford asked Toyota where the quality control division was. Toyota didn't understand the question. Instead of building cars and the fixing the mistakes and the defects at the end of the production line as the yanks did, the japs kept improving the processes so that the cars were built properly. 30 years later, Toyota became the biggest-selling car company in the world.