I__. - International Military Testing Association

knowledge-based model (equation 3) as a restricted version of the full task identity model
(equation a), the R’ increase associated with the full model may be tested. That test shows
that the R’ difference between these models, .13, is statistically significant: F(267,2258) =
3.1, p c .Ol. However, the skill and knowledge scales model accounts for 80% of the variance
accounted for by the full-task model. Thus, the skill and knowledge model has great
practical value for estimating TDS training time models.
Discussion
The skill-and-knowledge scale model is much more accurate than we expected. Also, it
permits training-time models--learning curves--to be estimated for tasks early in the design
process, and it provides feedback to designers concerning which particular task skill and
knowledge requirements are causing high training times. For these reasons, we believe that
the skill-and-knowledge trainingtime model represents a significant step forward in our
ability to design systems with acceptable training requirements, and to incorporate MPT
considerations into the weapons system design process.
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