This publication, which replaces "Standards for Library Functions at the State Level" (third edition) published in 1985) acknowledges and celebrates the richness and diversity of state library agencies while documenting the reality of what they currently do. The publication is divided into two sections. The first section of these standards provides a descriptive summary of the totality of collections, functions, and services offered by state library agencies throughout the country. Much of the information is presented in chart form and is based on a survey of all 50 United States that was conducted in Fall 1997. The tabular information is supplemented by short essays which provide specific examples of how individual states view or carry out certain services. Both common and uncommon services are presented, and insight is provided into what is typical and what is unusual. The second section of this publication deals on a more conceptual level with the roles that state library agencies can play in their respective states. This section concentrates more on library development aspects of state library agency work rather than on direct services. A final part of the second section discusses the movement toward more substantive evaluation by state libraries of their contribution to the welfare of a state and their use of both state and federal funds. (AEF)