Summary. This paper reports an investigation concerned with gathering information about the Morrisby Differential Test Battery in relation to various claims for its usefulness in vocational selection. Along with a pre‐constructed attitude scale, the complete test battery was administered to 154 entrants and 163 apprentices of three years' standing in several large firms within the British Iron and Steel Industry. In particular, the scores describing the Morrisby Modal Profiles were compared with Training Officers' ratings of similar characteristics. In the present paper the main analyses are from scores obtained by the older apprentices; some of the data on reliability coefficients were gained by retesting a group of entrants. It is the intention of the authors to follow up the entrants at the end of three years to obtain further information about the predictive validity of this test battery and to report this in a later paper. The individual reliability coefficients of the twelve tests comprising this battery are shown to vary widely. In view of the relatively small number of testees, these results can only be regarded as indicative and further studies are needed. The test manual lacks information about the validity of the battery, though extensive claims are made for the so‐called ‘modal profiles’ in estimating the intellectual ‘personality’ of the individuals concerned. Against the two criteria here employed, the ‘ability’ tests are shown to have more validity than the ‘personality’ profiles. The ‘skill’ tests show very low validity coefficients. Morrisby stresses the differential nature of his battery and suggests that a basic factorial structure is neither present nor intended. A preliminary factor analysis of scores obtained from this investigation showed four main factors of a type generally found in the analysis of large test batteries. A profile chart could be constructed on the basis of these factors which could be of use in vocational selection.
British Journal of Educational Psychology – Wiley
Published: Jun 1, 1965