## Why are there several OEE KPI’s?

“(Why) do we need different OEE KPI?” When the OEE Industry Standard team started, there were many similar discussions and argumentations heard.
A basic statement was: OEE measures the effectiveness of a machine, the equipment.

## x Quality Rate can not be determined immediately

Q:  Sometimes our process is being interrupted; i.e. the oven is stopped at a different moment than planned. At that moment it is not clear whether the product will be OK or not. We will block the product and take samples to determine the quality. This could take a couple of days. Wen everything is OK the product is released, otherwise it is being scrapped. This would have a retrospective effect on the OEE I guess? A correct quality rate -and thus OEE- for the day is no longer possible in this way. What number should I now use?

## x Measuring batches that run beyond the shift-limit

Q: When a batch is running at the moment when a new shift-crew comes in, we do not know how much volume was produced yet in that batch. How do we measure the batches to determine an accurate OEE now?

## x OEE – OOE – TEEP explained

Q: What is the difference between the OEE, OOE and TEEP measurements?

## x Machines are not always planned to run

Q: We run a 3 shift operation of 120 hrs a week, but some of our machines are not 100% planned to run due to the product mix we have.

How should we calculate the OEE?

## x Calculate OEE over multiple shifts

Q: My boss wants me to calculate and present a graphical OEE representation per week or month. So we need to calculate an average OEE over multiple shifts. I present this as I do with the daily data. I calculate the monthly OEE by taking the average of the daily OEE’s.

Is it alright to present a monthly OEE of the machines by calculating the average of several daily OEE’s in a month?

## x Calculate a monthly OEE

Q: My boss wants me to calculate and present a graphical OEE representation on a monthly basis. I present this as I do with the daily data. I calculate the monthly OEE  by taking the average of the daily OEE’s.

Is it alright to present a monthly OEE of the machines by calculating the average of the daily OEE’s in a month?

## x My OEE goes over 100%. What’s wrong?

Q: My OEE goes over 100%. What did I do wrong?

## x How to calculate OEE with mixed output?

Q: Our machine can run mixed output, so several different products, each shift. Till now we just recorded the time the machine was running and the output we had. Our software now requires that we register activities and quantities to account for every minute in a shift. But we are not tracking the number of minutes it ran each product.