Their subjects described five ways of knowing - received knowledge, subjective knowledge, constructed knowledge, procedural knowledge, all similar to those of Perry, and silence. From their data Belenky et al. distilled these five epistemological positions down to focus on two: preprocedural and procedural knowing, which corresponded to 'relativism' in Perry's scheme. In 1986 this work culminated in the publication of "Women's ways of knowing: The development of self, voice and mind".