This report was prepared in response to a request from the National Science Foundation to analyze the status of the Long-Term Ecological Research (LTER) Network technical supplements and to assess future technical needs. It provides a history of technical supplements in 1989 and 1990, and a snapshot view of several important technologies across the Network as of September 1990. Since that time, use of Ingres as a relational database management system has become more widespread across the Network. In addition, upgrades of ERDAS (version 7.5), ARC/INFO (version 6.0), and GRASS (version 4.0) are commonly being utilized. Recommendations for an updated minimum standard installation are currently being prepared for later publication by the LTER Network Office.