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Assessment was introduced in psychology as part of the scientific methodology applied to the study of mental and behavioural processes. Evaluation, both in quantitative and qualitative terms, was needed in order to fulfil the scientific aspiration to determine, measure and evaluate all phenomena involved in that research, and turning into a measurable form those elements not yet quantified (Pearson).

The ways to carry out assessment very soon diverged, as dimensions and elements to be considered by psychologists increased very rapidly and related to different aspects of their object of study. Research concentrated at an early moment on individuals, but soon after social and group aspects gained salience. At the turn of the century, psychologists became progressively engaged in practical affairs. They needed to know not only ...

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