Data for 2 multidimensional tracking tasks analyzed by components and total task were presented in an introductory analysis of the relative contribution of components to the total task. Whether the total task represented 2 or 3 components, the analysis (by trials) suggested that, as a first approximation, time of scoring in one component was essentially independent on time of scoring in the remaining components. The hypothesis of independence was tested by multiplication of the separate proportions of time on target and comparing the resulting value with that obtained by observation of the proportion for the total task. The comparison showed that fairly accurate prediction of total-task means and variances can be made, although small but systematic deviations suggest the need for additional research. The analysis brought out the implication that total-task performance can be improved by a redistribution of the on-target component proportions. In this way it suggested that over-all proficiency on some tracking tasks might be improved without raising S''s general skill level. Methods for bringing about redistributions are still untested.