cess of a system must be a combination of the measures of success of each individual assessment. Also, to implement several of the above techniques, some methods for combining measures of effectiveness are needed.

Finally, weapon system testing is very complicated, and ideally every decision should make use of information in a creative and informative way. To this end it may be useful to produce graphic displays of the results of the various tests. There are now available very effective and informative graphic displays that do not require statistical sophistication to understand; these may aid in making decisions as to whether a system is worth developing. Packages such as Lisp-Stat (Tierney, 1990) and S-Plus (Chambers and Hastie, 1992) include dynamic graphics. Tufte (1983) and Morgan and Henrion (1990) discuss methods for displaying information and accounting for uncertainty when making decisions. Such techniques can allow human judgment to be combined with formal test procedures.



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