In accordance with a long range plan for libraries in Colorado, a committee was appointed to develop the first standards for basic library service in Colorado public libraries. Libraries and their boards may use this document as a workbook for assessing their library and its services, as well as a document to assist in planning for the library's future growth and services. Each standard is followed by a box to be checked if the library is planning for achieving the standard, in progress toward achieving the standard, or has achieved this standard. By marking the appropriate box, libraries can determine areas of greatest achievement as well as areas that need addressing. Standards and guidelines are grouped by legal population service size. The report includes a definition of public library standards, a list of regional library service system contacts, and has standards and guidelines covering the following topics: administration--governance, management, planning, and finance; services and programming; collection; technical; cooperation/resource sharing; personnel; public relations; and facilities. (SWC)