Business Improvement with Six Sigma by Dr Anirban Basu (Express Computer, India IT weekly):
The organisation, a CMMI-level 5 company found that although the SLA (Service Level Agreement) with its US client specified that the support time for most critical (level one) complaints should not exceed 6 hours, on the average, it was taking 8 hours with variation from 2 to 14 hours. Further, its US client told them that the support time needed to be reduced to 4 hours because of strong demand from end-users for better service.
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