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I agree, but there's other aspects to target setting. A target should be challenging, but achievable, otherwise it can have a negative effect and be demotivational. In addition, to achieve some of these targets could cost a vast amount of money and resources, hence why we try to incorporate longer term thinking into target setting.
Anyway thank you again, it's made me realise I need to put more thought into my strategy.
The maths problem you set us is easy, we can get the maths right. Getting the right maths is the hard part - working out exactly what you should be calculating in order to achieve the desired result. Management by numbers follows the principle of optimising the numbers which can be measured easily, not necessarily the things which would actually improve business performance. You can see that, in the hands of an idiot (in which class we can include the majority of managers), a set of numbers which count the right-first-time rate of an operation could lead to the dumb target of telling everybody to improve their right-first-time rate by 10%. Anybody who is already over 91% can't possibly hit the target, and the worst performing departments get the easiest targets.