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Abstract
A factor-analytic study was carried out in order to construct a fatigue rating scale (FR scale) which allows a judgement of human fatigue through a person's appearance. Twenty-eight items for the prospective FR scale were prepared, combined with 20 items of a fatigue scale (F scale) which had boon factor-analytically classified into two groups, ‘ weakened activation ’ and ‘ weakened motivation ’. Sixty-five foremen of railway depots were asked to judge whether each of 48 items on the tentative rating scale was appropriate to an appreciation of human fatigue. The relationships among the items were investigated applying Tucker's inter-battery method. Kashiwagi's orthogonal factor rotation was performed. As a result, we selected 20 appearance-items for the FR scale which were divided into two groups, corresponding to the two factor dimensions of the F scale. We proposed an FR scale which consisted of the 20 items and the indications are that the scale is very practical in the sense of its wide applicability to the study of human fatigue.