In 1968 the Texas State Library established a library communications network under Title III of the Librar y Services and Construction Act. The objective of this study was to evaluate the network after six months of operation. Part I of the study consists of a general evaluation by Peat, Marwick, Mitchell and Co., based on operational data collected by the Texas State Library System, network evaluation criteria, a questionnaire administered to network participants, and analyses of data summaries. Findings are presented in terms of network costs, improved interlibrary cooperation, accelerated processing of interlibrary loans, improved patron satisfaction, adequacy of basic collections, and network use. The overall conclusion is that the network is achieving the initial objective of improving the interlibrary loan capabilities of participating libraries. Specific recommendations for improvement are made. Part II consists of a more detailed analysis by the Texas State Library Field Services Division of the data from the transaction sheets which the Division administered and tabulated for Part I of the study. This analysis includes comments on the ten Major Resource Center public libraries and size II libraries, general evaluations, recommendations, and discussion of network costs. An addendum includes data on the relationship of the network with the libraries. (JB)