## Acknowledgements ¶

While "a cast of thousands" may be an overstatement, it is certainly the case that this document represents the work of many people. First and foremost, thanks go to the authors of the Revised^4 Report on the Algorithmic Language Scheme, from which much of this document is derived. Thanks also to BBN Advanced Computers Inc. for the use of parts of their Butterfly Scheme Reference, and to Margaret O’Connell for translating it from BBN’s text-formatting language to ours.

Special thanks to Richard Stallman, Bob Chassell, and Brian Fox, all of the Free Software Foundation, for creating and maintaining the Texinfo formatting language in which this document is written.

This report describes research done at the Artificial Intelligence Laboratory and the Laboratory for Computer Science, both of the Massachusetts Institute of Technology. Support for this research is provided in part by the Advanced Research Projects Agency of the Department of Defense and by the National Science Foundation.