沙拉的社会认识论把知识理解为“书写记录”,并根据载体的不同而区分为“内在知识”和“外在知识”,而传播则构成了人们获取知识的主要途径。其思想对于图书馆与信息科学的主要作用:规范性的理论框架、信息分类的规范性扩展、信息仲裁服务和专家意见的批判性完善。最后本文指出了其所面临的信息哲学的挑战。 Sarah’s epistemology of society regards knowledge as “written record” and divides it into “inner knowledge” and “extrinsic knowledge” according to the carrier, and communication constitutes the main way for people to acquire knowledge. Its main functions for the library and information science are: normative theoretical framework, normative extension of information classification, critical improvement of information arbitration services and expert opinion. Finally, this paper points out the challenge of the information philosophy it faces.