Purpose: Information sharing is a relatively unexplored part of the information behaviour. The aim of this paper is to examine the research on the concept, as it appears in other bodies of literature and to draw out the key variables that appear to influence information sharing in different contexts. Methods: A literature review was carried out using the Scopus database, to identify the contexts and perspectives under which information sharing, information exchange or knowledge sharing has been discussed. Findings: A small number of key variables regularly appear in the information sharing literature. Some are limited to a particular context, e.g., sharing patient data in health care organizations, while others appear to have more general applicability. Four variables are identified that appear to be relatively common: trust, risk, reward (or benefit), and organizational proximity. Conclusion: The analysis presented could be employed both to guide an investigation into information sharing in organizations and to offer guidance to organizational management on the circumstances under which information sharing may take place readily, versus those circumstances under which sharing must be either negotiated or difficult to achieve. (Contains 1 table and 5 figures.)