So you have finally started to measure your failure costs (all the costs incurred by doing thinks wrong first time), and can now put a monetary value on how much you have to currently spend to generate the quality your customer demands.
And you realise it’s a big, big, number.
How big do we mean? We have worked with organisations where, on first measurement, we discovered the Cost of Quality was sitting at +/- 20% of turnover: effectively, this is 20% of turnover that nobody gets – it just disappears as a “normal cost of doing business”. So, a complete waste. Great organisations, by way of comparison, spend 3% of turnover, and target a reduction every year – we know of one highly successful business that even targeted a 50% reduction EVERY YEAR.
Discovering high Failure Costs through measurement is the moment where, in many organisations, panic sets in. The consequence of panic is often a knee-jerk reaction, and the knee-jerk reaction we see most often is, “we’ve got to inspect everything to make sure it’s right”.
So staff are redeployed and inspection stations set up – goods receiving to inspect incoming raw materials, each workstation to make sure what is received from the previous workstation in line works, pre-final-assembly to make sure all the components function individually, and then pre-dispatch to make sure nothing has gone wrong in final assembly. Sometimes we even see specialist inspectors brought in to supplement the production team.
Let’s take a really prosaic example to see the good sense in doing this.
One of the 200 components in your finished product is a rubber plug that fits into one of the end caps of your product and must stand between 1.18 and 1.22mm proud of the surface when hand-pressed into place. The plugs are delivered in boxes of 2000 on pallets of 400 boxes.
Clearly you can’t measure every single plug to check if it is dimensionally within spec, so you generate a random sample plan and stipulate that if appraisal returns a random sample of more than 2% off-spec, the pallet is rejected (2% is actually very tight control – many sample plans we see accept anything up to 10% off-spec).
Your inspector tests a random sample from a pallet and finds 1.5% of the sample off-spec, so passes the pallet into the stores, to be used in production. It is dutifully noted down that 1.5% of the sample was off-spec so everyone is happy. The inspector has done the job, stores are happily sitting with full shelves, and production knows they will not run out of rubber plugs. Job done, and you can look forward to significant reduction in Failure Costs, and be back home in time for tea and bonuses.
Except…..12,000 faulty rubber plugs have just found their way into your production process.
Bottom line is that inspection, or appraisal, often only generates a statistic. It rarely actually physically finds faults or duff products.
So you pay for the staff, you pay for the time, you pay for the delay in processing inbound goods, you pay for everything and you are still building faults into your products. Simple reason: APPRAISAL ONLY WORKS IF YOU INSPECT ABSOLUTELY EVERYTHING.
The business risk is that you now have the following situation: you started with high failure costs, so you decided to appraise/inspect everything. Appraisal/inspection doesn’t significantly reduce your failures, but you have the added cost of staff, time, reduced uptime, rejected product etc etc etc. In essence, you may have made your financial situation even worse.
So Failure Costs are a no-no, and Appraisal Costs often don’t contribute to the reduction of Failure Costs.
In our next post, then, we will look at the only way to sustainably reduce your Cost of Quality….through Prevention.
