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Abstract In this paper we argue that the lack of attention to the third sector historically is primarily a result of the weakness and limitations of the concepts that are used to define and describe it. The purpose of this article is to remedy this situation by developing a general definition of the sector that can be used in comparative research. To do so, the article first identifies four alternative types of definitions that are potentially available and evaluates each in terms of three basic criteria. On this basis it concludes that the most useful definition is the ‘structural/operational’ one, which includes in the non-profit sector organisations that share five basic characteristics. These are: formal, private, non-profit-distributing, self-governing and voluntary. The basic definition is then tested against the realities of three disparate countries and found to perform quite well. On this basis we recommend the structural/operational definition, particularly for comparative, cross-national research.
Salamon et al. (Sun,) studied this question.