This article discusses the development and application of various types of corporate social monitoring systems. Boycotts are a relatively simple form of social monitoring system which aim to produce changes in corporate social behavior. Boycotts may be organized by a single group, or by a number of groups simultaneously. Rating systems may be organized around a single issue, such as the Sullivan Principles rating scheme, or may include multiple companies and multiple issues, such as shopping guides or ethical investment systems.Monitoring (...) systems may be unidimensional or multidimensional, qualitative or quantitative, and absolute or relative. Consumers and investors appear to be the groups most likely to be targeted in these schemes. The importance of these monitoring systems appears to be increasing as both consumers and investors become more interested in using social criteria in decision-making. (shrink)