Copyright 1980, 1982, 1983 owned by the United States Government as represented by the Under Secretary of Defense, Research and Engineering. All rights reserved. Provided that notice of copyright is included on the first page, this document may be copied in its entirety without alteration or as altered by (1) adding text that is clearly marked as an insertion; (2) shading or highlighting existing text; (3) deleting examples. Permission to publish other excerpts should be obtained from the Ada Joint Program Office, OUSDRE (R&AT), The Pentagon, Washington, DC 20301-2081, U.S.A.