This paper gives an overview of major issues in trust research, identifying common foundations and multiple constellations of organizational trust. In doing so, the paper also addresses important implications of theory development and empirical research. First, it provides a historical sketch of different approaches to understanding the phenomenon of trust, drawing upon various social science disciplines. Second, it discusses different levels of analysing trust in organizational settings. Third, it deals with important issues of operationalisation and measurement of organizational trust. Finally, it briefly summarises the contents of the five papers that follow this introductory paper in the special issue of JMP on ''The microfoundations of organizational trust''.