Public libraries have been associated with a Habermasian public sphere, but articulations between public libraries and the public sphere remain undefined. To make fuller sense of the public sphere as it relates to public libraries, we used qualitative content analysis as a research methodology to study 12 Carnegie Library of Pittsburgh annual reports from 1900 to 2010. We identified 6 dimensions of the public sphere in public libraries: Core Criteria, Internal Public Sphere, External Public Sphere, Collect and Organize Discourse, Perform Legitimation Processes, and Facilitate Discourse. Using the dimensions we found, we developed a model to explain how public libraries function as instruments of the public sphere.

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Public library systems intersect with both public and private spheres of social life, but how they do so remains a mystery. Many believe private influences distort the public sphere in public libraries, and if so, then library legitimacy suffers, raising normative and material concerns for library systems. To better understand how libraries negotiate public legitimacy and private influence, we approached the problem using a communications system framework. We used qualitative content analysis to examine data from three US public library systems: Carnegie Library of Pittsburgh, New York Public Library, and Cary Memorial Library in Lexington, Massachusetts. We recorded the many ways private actors communicate with and through public library systems. Then, we analyzed the signals in terms of their components: transmitter, receiver, medium, and message. We found two dimensions: in the Public Sphere dimension, private actors govern, legitimate, and use the library, and in the Private Sphere dimension, private actors exchange personal services and exert economic power. We describe the communication channels shared by private actors and public library systems, identify signals associated with governance, influence, and legitimacy, and consider how these signals relate. This study explores the signal architectures of social life in public libraries.

Public library development is explained differently by various theories, but existing theories are problematic. A new theory is needed to explain public library development, one that foregrounds political processes. To produce this new theory, a historical case study was conducted of a regional public library system in the United States from 1924 to 2016. Multiple data sources and mixed methods were used to identify the causes of library development in nine periods of the case. Findings indicate that public libraries develop in a cyclical way. Within each decision cycle, high responsiveness is a necessary condition for a change in development. A responsive library system adapts to and acts upon discursively-legitimated issues. High responsiveness, together with either high civil support, high legitimacy or low resistance, are causal configurations sufficient for change. This theory is significant because it is testable, it uses a new research framework and new methods, and it provides new insight into public library development.

Public libraries continually struggle to define their social value, and economic or educational rationales are commonly submitted to this end. In contrast to these approaches, public sphere theory emphasizes the political and social justice aspects of public libraries. Existing library literature has established strong associations between public sphere theory and public libraries, and a tentative model of the public sphere in public libraries has been developed. It is not yet clear, however, how a public sphere model of public libraries might benefit the profession. This paper therefore explains how a conceptual model of the public sphere in public libraries can serve as a potential framework and research agenda for the public library sector. A model of the public sphere in public libraries contains three main arenas of discourse: governance, legitimation, and commons. Each of the arenas represents values that are central to public librarianship. Practitioners and scholars in the public library sector can use the public sphere model to orient research and practice. This paper explains each arena in detail and discusses the model's relevance as a philosophy and research agenda.