Summary The relationships between pupils’ performances at O‐level and A‐level in the papers comprising the examinations in physics (Nuffield) is investigated and discussed in terms of their value in providing evidence of the validity of the O‐level examination. In addition data are presented which suggest the probabilities of students with given grades at O‐level obtaining various degrees of success in the A‐level examination.
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A.J. Massey (1978) studied this question.