A prototype derived from two or more ICM s providing highly schematic information. A composite prototype can give rise to further variants established via convention, and thus provides prototype structure for a radial category. The composite prototype for the category mother, for instance, includes a female who gave birth to the child, was supplier of 50 per cent of the genetic material, stayed at home in order to nurture the child, is married to the child's father, is one generation older than the child and is also the child's legal guardian. Thus the composite prototype draws upon information from a number of distinct ICMs associated with the cluster model for mother including: the birth model, the genetic model, the nurturance model, the marital model, the genealogical model and the housewife-mother model.