Diagnose · COGQ vs COPQ

COGQ vs COPQ

What it is

What it shows

Cost of good quality (prevention and appraisal) and cost of poor quality (failure) per month, with an optional forecast and its uncertainty band.

Why it matters in manufacturing

This is the classic quality-cost trade-off: spending on good quality should bring the cost of poor quality down over time.

How to read it

Look for the lines to move apart: COPQ falling while COGQ holds or rises means the investment pays back. The forecast continues the trend; the shaded bands show where the coming months will probably fall (80% and 95%).

What good looks like

The COPQ line falls while the COGQ line holds or rises a little, so the lines move apart with COPQ below COGQ, and the forecast keeps that direction.

Expert view

The expert is reading the figures…

Concern

There is a problem here worth looking into.

What we observe

Good: The cost of poor quality fell from $953k to $698k a month (−27%).
Good: Spending on good quality rose from $571k to $660k a month (+15%).
Good: More spent on good quality (+15%) while poor-quality cost fell (−27%): the investment appears to pay off.
Problem: Failures make up 57% of quality cost: most of the money goes to fixing problems rather than preventing them.
Watch: Sep 2025 stands out at $2.03M, 2.6 times a normal month (1 such months).

Keep in mind

One set has a record count that differs from AlisQI.
The token cannot read 5 sets, so the total may be partial.

Computed by the app from the figures in this view. Data as of 9 Nov 2026 02:14.