External validity is typically regarded as the downside of case study research by methodologists and social scientists; case studies, however, are often aimed at drawing lessons that are generalizable to new contexts. The gap between the generalizability potential of case studies and the research goals demands closer scrutiny. I suggest that the conclusion that case study research is weak in external validity follows from a set of assumptions that I term the "traditional view," which are disputable at best. In this (...) view, external validity is treated as a matter of mere representativeness. I argue that it is best understood instead as a problem of inference and that the emphasis should be placed on the comparability of the study rather than on the typicality of the case. By making case studies highly comparable, their external validity can be reliably and efficiently assessed and, in this way, their generalizability potential enhanced. (shrink)

In the last decades philosophers of science and social scientists promoted the view that knowledge of mechanisms might help causal inference considerably in the social sciences. Mechanisms, however, can only assist causal inference effectively if scientists have a means to identify them correctly. Some scholars suggested that process-tracing might be a helpful strategy in this respect. Shared criteria to assess its performance, however, are not available yet; furthermore, the criteria proposed so far tie the validity of process-tracing findings to the (...) specific kind of evidence it uses. In this paper I shall propose a criterion to assess process-tracing performance in cases in which favorable epistemic circumstances do not occur and the existing criteria thus fail to apply. The criterion I propose does not double as a condition for validity. Rather, it aims to assess whether the mechanism process-tracing outlines constitutes admissible evidence for the hypothesis at hand. It will be argued that only if this requirement is fulfilled process-tracing can be used as an effective complement for causal inference. (shrink)

The claim that randomized controlled trials can improve policy-making in developing countries seemed to be severely challenged by the widespread belief that RCTs lack external validity. This belief led to the articulation of strategies to alleviate this problem which developed under the assumption that policy-making in developing countries can be best understood as a problem of prediction. The causal structures that characterize developing contexts, however, render this framing inadequate. I propose to understand policy-making in developing contexts as a planning process. (...) In this new framework, the relevance of several kinds of evidence is highlighted and the role of causal effects refocused. Interestingly, also the concern for the external validity of causal effects seems now less forceful than the critics of RCTs suggest. (shrink)

International Studies in the Philosophy of Science, Volume 25, Issue 3, Page 293-296, September 2011.

How should we theorize about the social world? How can we integrate theories, models and approaches from seemingly incompatible disciplines? Does theory affect social reality? This state-of-the-art collection addresses contemporary methodological questions and interdisciplinary developments in the philosophy of social science. Facilitating a mutually enriching dialogue, chapters by leading social scientists are followed by critical evaluations from philosophers of social science. This exchange showcases recent major theoretical and methodological breakthroughs and challenges in the social sciences, as well as fruitful ways (...) in which the analytic tools developed in philosophy of science can be applied to understand these advancements. The volume covers a diverse range of principles, methods, innovations and applications, including scientific and methodological pluralism, performativity of theories, causal inferences and applications of social science to policy and business. Taking a practice-orientated and interactive approach, it offers a new philosophy of social science grounded in and relevant to the emerging social science practice. (shrink)