A survey of clerical workers' attitudes toward their work identified a group of secretaries with very positive attitudes  They responded Strongly agree to such statements as I enjoy word processingand I like learning new secretarial skills   These secretaries had been rated by their supervisors as excellent workers -- far better than secretaries whose attitudes were identified as less positive
Clearly these secretaries' positive attitudes toward their work produced excellent job performance
It attempts to prove a generalization about job performance by using the single example of clerical workers.