What is the best way to obtain a case study about one of company services?

One of the best ways to prove one's worth is through the creation of a compelling case study. In order to provide a valuable case study, one need to select the most qualified candidates. These candidates must have - product knowledge (should be well-versed in the logistics of services or products), exemplary result (the best result can make stronger case studies), recognizable names (even small companies have powerful stories and notable brands to increase their credibility), switchers (candidates who have come from a competitor help highlight  competitive advantages).