As we’ve all been learning, case studies are an in-depth look at an individual’s experience and behaviour, and trying to relate this to their context (Flyybjerg, 2011). These studies are often longitudinal and can be studied in a wide variety of ways, such as interviews, observations etc. and provide a means for investigating cases that cannot be carried out in a lab. Generalisability of such studies however holds much reservation amongst some psychologists and drawing cause an effect relationships can be questioned. With such limitations however, do case studies hold much strength for further development in psychology?
Case studies are often used in qualitative research, and as is such the case for much of this type of research, they are frequently used in order to generate new hypotheses. This in-depth research often investigates ideas that are otherwise hard to research and thus these new findings can lead to testing of such topics by other methods, such as quantitative research. It was such investigations of Phineas Gage for example that showed how vital the left frontal lobe was in the control of personality and behaviour (Barker, 1955). Without a case study on this individual, it is unlikely that such information would have been found, certainly at this time (Campbell, 1851). It then appears that case studies can aid psychologists in novel findings. It is particularly useful for humanistic psychologists who adopt a holistic point of view, however, many limitations still stand.
As indicated above, one of the main issues of concern with validity of case studies is their generalisability. This is concerned with whether the research can be applied beyond the lab environment and out to the general population. As case studies are often conducted because the participant(s) are unique and/or their cases are incredibly rare, taking one individual’s behaviour and personality and saying either this is how people with such cases will act the same or certain issues result in certain behaviour. Variables in such studies are very hard to control and the results are often descriptive. Drawing a valid conclusion as to the cause of the results therefore is limited too if they results are often descriptive, rather than inferential. Surely, the whole point of psychology is to draw conclusions and to explain how this affects the population. Whilst studies may look in-depth into cases, if these results cannot be generalised and often draw cause and effect relationships, then this form of research is very weak and can do little to assist in further research based on these findings.
Overall, case studies are very good at showing in-depth relationships, particularly in unique participants. However, when it comes to psychology, their generalisability is very weak, the conclusions they can draw do not often show cause relationships, and therefore are a weak form of research for the future of psychology.