important to do so, and that modest progress towards attaining reasonable goals is currently being made. There is much work to do.
This research was supported primarily by the Advanced Research Projects Agency of the Department of Defense and was monitored by ONR under Contract No. N00014-77-C0378. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the Defense Advanced Projects Agency or the U.S. Government. The research was also supported in part by the National Science and Engineering Research Council of Canada under Operating Grant A9285 and by National Science Foundation Grant IST-8012418. Our thanks go to David Waltz, Harry Tennant, and Brad Goodman for providing and discussing the PLANES transcripts, and to Candy Sidner and Bill Woods for their comments on the chapter. Special thanks go to Norma Peterson for her invaluable help in preparing this chapter.
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