I've implemented 5S, Hoshin, 6 sigma, Toyota manufacturing system and a lot of other systems into a number of factories over the years. What I've found is that common sense is the prevailing and underlying philosophy of all the systems. All are excellent, all make a massive improvements in productivity and quality but all require common sense....a rare and exceptional hard talent to find.
These are my quick questions to explain all the systems listed above. If the answer is obvious to each your an expert in all modern manufacturing systems. Rather a simplistic perspective I know, but then again I don't sell my sole as a consultant in it....
Why make it wrong and make it twice?
Why not move machines or processes closer together so you don't move it 100m rather than not moving it all?
Why not service and care for your machines and processes rather than wait for them to fail of become too stiff to operate and then fix them?
Why hide tools and things away or 'pop' them down when you can have a dedicated place where it's clear it should be?
Why wouldn't you keep spares or saw blades, drill bits, extra sand paper or alike so you don't run out half way through a job?
Why would you want a dirty messed workshop with stuff all over the floor just waiting to trip / cause an accident?
Why not make a jig to you can cut / sand / plane / or what ever correctly every time?
Why wouldn't you plan how you intend to make something?
Why wouldn't you listen to what your customer wants and make what they ask for rather than what you can / want to do quickest / cheapest?
Why would you expect your employees to do what you want them to do if you don't keep them informed and involved with how your business is developing and evolving?
Why would you expect a novice to be as capable as a time spent expert unless you train them?
Why send or do something for the customer you wouldn't accept yourself?