Why Quality Is Planned, Not Inspected In

The cost of finding problems late, and what planning changes about where problems are found.

11 min

Activities: 0 of 2

The problem planning solves

Every organisation controls quality somehow. The question is when. Some organisations wait until the product exists and then inspect it. Others decide, before the first part is made, what can go wrong, which characteristics matter most, how each one will be controlled and what people will do when a check fails. The second approach is quality planning.

Inspection alone has two weaknesses. First, it finds defects only after the cost of making them has been spent: material, machine time and labour are already gone. Second, inspection is never perfect. People get tired, gauges drift and samples miss rare defects. A plan that depends only on catching defects will let some of them through.

Why late discovery costs more

A problem costs more the later it is found. A wrong tolerance found during design review costs one drawing change. The same error found at first article inspection costs a tooling change and a delay. Found after shipment, it costs sorting at the customer, replacement parts, freight, investigation time and damage to trust. Found in the field, it may cost a recall or an injury.

Quality planning moves the discovery of problems earlier. It does this by asking structured questions before production: What does the customer need? Which characteristics carry the most risk? Can the process hold the tolerance? Can we measure it? What happens if it goes wrong?

Two ways to run the same launch

A new bracket goes into production straight from the drawing. Operators check "what looks important". After two weeks the customer rejects a shipment because a hole position is out of tolerance. Nobody knew it was a key characteristic, so nobody was measuring it.

Worked example: a service contract

Quality planning is not only for factories. A maintenance contractor wins a contract to service fire pumps at twelve sites. Without planning, each technician uses their own method. With planning, the contractor first lists the client's requirements, the relevant standard and the legal test intervals. It then defines the checks for each visit, the acceptance values for flow and pressure, the record each technician completes and what happens when a pump fails a test. The first site audit finds consistent records at every site, because the method was decided before the work started.

Common mistakes, and the fix

A customer finds an out-of-tolerance hole position after delivery. The plant was inspecting the part, but not that feature. What is the most likely planning failure?

Complete the idea

Inspection finds defects only they are made. Quality planning moves the discovery of problems , when they cost to correct.