This Memorandum is the first of a three-part final report on the GRAIL (GRAphical Input Language) Project sponsored by the Advanced Research Projects Agency of the Department of Defense. The study was an integral part of both RAND's and the client's overall program to explore man-machine communications. The Memorandum states the philosophy adhered to in this computer-graphics experiment, describes the problems that were identified, and notes further research directed to these problems. The techniques developed are described in the context of the experiment itself although they are suitable for a larger class of applications.
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