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Classical test theory (CTT) embraces a whole set of models and technical procedures designed to provide solutions to the problems involved in measuring psychological variables. When psychologists measure a variable, thus obtaining an empirical score, their interest lies not in the score itself, but in the inferences and interpretations that can be made from it and that can provide information on some aspect of the assessed person's behaviour. Of course, for these interpretations and inferences to be well founded it is necessary to have precise knowledge of the different psychometric properties of the instrument employed. CTT offers such coverage, allowing detailed description of the metric characteristics of the measurement instruments normally used by social scientists and professionals. On labelling this set of knowledge as ‘classical’ ...

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