Spearman proposed the principle of the "indifference of the indicator", according to which the precise content of intelligence tests is unimportant for the purposes of identifying "g", because "g" enters into performance on all kinds of tests. Any test can therefore be used as an indicator of "g". Following Spearman, Arthur Jensen more recently argued that a "g" factor extracted from one test battery will always be the same, within the limits of measurement error, as that extracted from another battery, provided that the batteries are large and diverse. According to this view, every mental test, no matter how distinctive, calls on "g" to some extent. Thus a composite score of a number of different tests will load onto "g" more strongly than any of the individual test scores, because the "g" components cumulate into the composite score, while the uncorrelated non-"g" components will cancel each other out. Theoretically, the composite score of an infinitely large, diverse test battery would, then, be a perfect measure of "g".