Zst

Often called 'benchmarking sigma' or 'sigma value'. The distribution, or variation, or spread around the mean(average) value of any process or procedure. For a business process, the sigma value indicates how well that process is performing, i.e. Zst is a short-term capability index of a process or a part(Zst=1.0 is bad, Zst=4.0 is mediocre performance, Zst=6.0 is considered 'worldcalss').