case study
noun [ C ]
ukusa detailed study of a person, group, or thing, especially in order to show general principles:
A case study by PriceWaterhouseCoopers assessed the annual fiscal impact of a US football team.
something or someone that can be used as an example to show general principles:
a case study on/of/in sth The town can be seen as an interesting case study on the effects of globalization.