COIMBATORE: The software development and delivery centre in Coimbatore of Cognizant, a leading Information Technology services provider, has been appraised at Maturity Level 5 of the latest version of 1.2 of Capability Maturity Model Integration. The Coimbatore centre has developed a unique operational model that integrates best practices such as CMMI, lean manufacturing and six sigma to improve operational efficiency and productivity, says a release.