Case study research does not make any direct claims to be generalisable to wider populations. However, Yin (1994) has suggested that by conducting a cross case analysis of innovations in similar contexts there can be wider generalisation.

This paper presents the results of a systematic review of action research that sought to identify those factors which facilitate and inhibit change in health care practice. The findings from this cross case analysis are compared with the findings of a single case study, which, while focusing on the introduction of lay participation in care in a hospital setting, highlighted some important process issues related to changing health care practice (Meyer 1995). The comparative results between these two studies (systematic review and single case) suggest that it may be possible to generalise more widely from action research. The paper argues that the findings from action research more closely reflect reality and are potentially more valid and meaningful to others.