“…As regards the need-fulfilment measure, a pilot study in which the scale was administered individually to a comparable sample (which gave them an opportunity to comment on each item) revealed that they had no difficulty in understanding the various items. In addition, the fact that this scale has been used successfully in a variety of jobs and been found to relate highly to a number of relevant external criteria (Porter, 1962(Porter, , 1963Porter and Henry, 1964;Porter and Mitchell, 1967) suggests that it should be pretty valid in the present context. That the scale was simply used to obtain an overall score for each S is supported; by a recent factor analytic study (Herman and Hulin, 1973) which found that a single dimension, rather than five separate dimensions (for each of the needs covered by the scale) could best account for the score variance.…”