why the ISO so important for the factory?for example to the internal enviroment like why the worker needs to w

Answer 1

ISO is a certification of processses used in development or manufacturing by a properly authorized organizatrion. All it does is make sure that everything that is done is documented and that records are maintained. It doesn't guarantee quality of the product - just that everything is documented. It's basically a way that quality organizations stayed in business after their importance was lessened in most businesses. I have worked with the system for years and see very little value added.

Answer 2

The significance of ISO is that things are done procedurally, not "by the seat of the pants".

So if you are doing something critical, and need the company to collect material certs when they buy materials, and clear pre-determined inspection or process witness hold-points, you can be more assured that this will happen in an ISO facility, because you can drop in a procedure as a customer, and know it will be followed, as opposed to companies that do no planning and no organizing of their tasks and requirements - and mercilessly cut corners.