The items on a particular subtest of a carefully constructed aptitude test battery have low correlations with each other, but scores on the various subtests of which the battery is composed are highly inter-correlated.

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A carefully constructed aptitude test battery is designed to measure different dimensions or aspects of aptitude, meaning that while items within a particular subtest should be highly correlated with each other to ensure they are measuring the same underlying construct, the various subtests should not be highly inter-correlated if they are meant to measure different constructs or aspects of aptitude. High inter-correlations between different subtests could suggest redundancy or a lack of distinctiveness in what each subtest is measuring.

The Items on a Particular Subtest of a Carefully Constructed