Simple Definition of case study
a published report about a person, group, or situation that has been studied over time; also : a situation in real life that can be looked at or studied to learn about something
Full Definition of case study
an intensive analysis of an individual unit (as a person or community) stressing developmental factors in relation to environment
Merriam Webster, accessed 22 April 2016, <http://www.merriam-webster.com/dictionary/casestudy>