The core of a factory is management, not photography. The same product tested at a different time, by a different operator, on different equipment, by a different method, will give a different result - and in practice that happens almost every time. So the thing worth evaluating is the process control, not the building.
The core of a factory is management, not photography. Take the
same product and test it at a different time, with a different operator, on
different equipment, by a different method, and you will get a different
result. In practice that is very close to a rule of thumb rather than an
exception. So what is worth evaluating is process control, not the building.
The laboratory version of the same problem
In the lab we do not talk about whether a product is "good". We talk about
how much the result moves when you change one variable. Time, operator,
equipment, method - any of them, and the answer shifts. I would put the chance
of a meaningful difference at close to 99%.
That is not a complaint about laboratories. It is a statement about
measurement, and it is why a certificate means much less than people assume. A
number tells you what was found, once, by somebody, under conditions they
chose.
Production is the same problem
The variables that cause quality to drift in production are human and
temporal. Somebody is doing the work, at a certain time, on a machine in a
certain state. Controlling how people behave inside the process is what
management actually is - and it is the closest you get to a side-on view of
whether the goods will be consistent.
So what matters instead of photographs
Process control points. Where each stage of the process is verified, who owns
that check, what happens when a check fails, and what the final inspection
covers.
A factory with no process control and no final product inspection cannot hold
quality. It does not matter how large the plant is or how modern the equipment
sits there. That is the whole argument, and it is a management argument rather
than a photographic one.
Questions this note answers
Professional factory photos still tell me nothing useful?
They tell you the factory exists and that somebody took a camera into it. Beyond that they are decoration. Anyone can photograph a clean workshop. What separates a good plant from a bad one is whether each step of the process is checked as it goes, and whether the finished product is checked at the end. A factory with no process control and no final inspection cannot hold quality, however large it is and however modern the equipment.
Why is it the same product that varies between batches?
Because the variables are human and temporal. Time, operator, machine state and method all move. In the laboratory we assume the same product tested under different conditions gives a different result - that is close to a rule of thumb, not an exception. Production is the same problem with the same answer. Which is why managing people inside the process is what actually determines the consistency of what you receive.
So what should I ask about, instead of looking at pictures?
The control points. Where in the process each stage is verified, who is responsible for that check, what happens when a check fails, and what the final inspection covers. Then delivery time, packaging, and how a quality claim would actually be handled. These are questions with answers or without - there is no version of the story where a supplier can look professional and dodge them all.