Performance Indicators (PI)
Key performance indicators define a set of values against which to measure. These raw sets of values, which can be fed to systems that aggregate the data, are called indicators. There are two categories of measurements for KPIs.
Quantitative
Quantitative facts without distortion from personal feelings, prejudices, or interpretations presented with a specific value - objective- preferably numeric measured against a standard.
Qualitative
Qualitative values based on or influenced by personal feelings, tastes, or opinions and presented as any numeric or textual value that represents an interpretation of these elements.