Key Performance Indicators are indicators which give information on how far we have succeeded in accomplishing the work that we have set.
Key Performance Indicators must be measurable. Should be calculated / measured. The Indicators must refer to the results of our work (work output). Measures of success must demonstrate clear performance indicators, specific and measurable.
Measures of success must be explicit and detailed that it becomes clear what is measured. The cost to identify and monitor the success of size should not exceed the value of which will be known from these measurements. Avoid excessive measures that provide little added value.