A case study is a research approach that is used to generate an in-depth, multi-faceted understanding of a complex issue in its real-life context. It is an established research design that is used extensively in a wide variety of disciplines, particularly in the social sciences.
A case study can be defined in a variety of ways, with the central tenet being the need to explore an event or phenomenon in depth and in its natural context.
The primary difference between a portfolio item and a case study is that the former presents the work or materials delivered; whereas the latter explores the outcome resulting from the work or materials delivered. For example: a case study for Phvntom might explore how much a company’s revenue increased after we launched their new website, while a portfolio item would only show the new website itself.