This chapter focuses on judging systems in terms of the supply of education: Do they coordinate providers in a way that leads to efficient provision of education? The several analysis is organised in terms of three coordination mechanisms highlighted by A. O. Hirschman: exit, voice and loyalty. The chapter examines ways in which each system addresses the challenge of how providers use what they know. It considers the ways in which each system deals with the knowledge problem: having/creating/disseminating knowledge. The chapter reviews the provision of education, they concentrate on arguments that are pertinent to the provision of any good or service. It also considers arguments that education is different from other goods and services. The chapter also examines how these arguments affect the way in which general characteristics of markets, hierarchies and networks bear upon the provision of education.