Briefing Document is by no means final. While a conscientious attempt was made to identity and quantify those system parameters that are important to astronomy, the document is based on the reference system. As mentioned in the Briefing Document, major design changes are 1ikely--perhaps as a result of this assessment effort--and these changes may affect assumed system properties in a major way. For example, G. D. Arndt's invited presentation includes design changes that reduce grating side lobe intensities by a factor of 10 from those given in the Reference System report. Many of the workshop participants were asked to prepare reports on specific topics that we felt would be important areas of discussion. These reports were to be based on the characterization of the system as described in the Briefing Document. Each participant was provided with a copy of both the Briefing Document and the Reference System Report about three weeks prior to the workshop. The workshop itself was convened with a statement read by R. A. Stokes of PNL which serves as the preface to this report. Following this introductory statement, the invited contributions were presented and discussed. This process took most of the first day, after which the participants were divided into optical and radio working groups for more detailed consideration of SPS effects on astronomy. The form and content of the working group meetings were largely left to the members of each group with one exception: Both groups were specifically asked to discuss and comment on the possibility of moving the affected portions of astronomical observations to facilities located in space or on the far side of the moon. ORGANIZATION OF THE REPORT The entire process of convening, conducting and summarizing this workshop fell into two natural divisions from the outset. We have, with reasonable accuracy, described these two sections as optical and radio effects, respectively. From one viewpoint, this division is in keeping with an astronomical tradition of dividing the profession according to the portion of the electromagnetic spectrum that is observed. From another viewpoint, the division expresses the separate effects of the passive and active properties
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