A system for measuring an ability of a subject. The system includes a set of tasks (10) that require the subject to provide one or more spoken responses. A speech recognition system (20), which is coupled to receive the spoken responses, provides an estimate (50) of the spoken responses. The estimate (50) may be an estimate of the linguistic content and/or other characteristics of the response. The speech recognition system (20) has an associated operating characteristic relating to its ability to recognize and estimate the content of responses and elements of responses. A scoring device (30) converts the response estimate (50) into one or more item scores (60). A computation device (40) provides a subject score (70) using a scoring computation model that depends upon the expected item-dependent operating characteristics of the speech recognition system (20). (FIG.1)
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