The study investigates the impact of the introduction of a new class of errors within the original error set of the reading subtest of the Performance School Test on the distribution of the scores. The sample consisted of 306 1st - 4th grades of the school system of Belo Horizonte who participated in the study. For each child two scores were given: one based on the manual criteria (EB1) and the other on the criteria introduced in the present study (EB2) - which considered explicit sounding out of syllables or of part of the stimuli and self-corrections as incorrect responses. The results showed that the choice of the EB2 made the test more discriminative, but such a modification did not prevent the emergence of a ceiling effect, nor did it enable a normal distribution of the scores. The analysis showed that apart from the permissive criteria the excess of easy words and the shortage of difficult words affected the variability of the scores. Hypotheses about the difficulty of words were discussed in light of the psycholinguistics.
Word recognition task; criteria for correct responses; item discrimination power
