The aim with this master?s thesis is to examine the information practices and information literacies among social workers in the field of the social services and in the work with child welfare investigations. This is in this study related to their ambition to fulfill the requirements of an evidence-based practice. On a theoretical level, the study is based on three theories grounded in the idea of situated learning and of human activities based in a social context. These are the sociocultural theory, the theory of communities of practices and the theory of information practices.