I then examine different case study research designs, including comparable cases, most and least likely cases, deviant cases, and process tracing, with attention to their different purposes and logics ...

Maggie Breslin, Richard Buchanan, On the Case Study Method of Research and Teaching in Design, Design Issues, Vol. 24, No. 1 (Winter, 2008), pp. 36-40 ...

The answer was a resounding yes: spoons in research institute tearooms seem to have legs. While good fun, the research is a good example of a study design referred to as “longitudinal”.