Management, in any continuously successful plant, is not related to single workers but always to working groups. In every department that continues t… - Elton Mayo

The difference between a good observer and one who is not good is that the former is quick to take a hint from the facts, from his early efforts to develop skill in handling them, and quick to acknowledge the need to revise or alter the conceptual framework of his thinking, The other — the poor observer — continues dogmatically onward with his original thesis, lost in a maze of correlations, long after the facts have shrieked in protest against the interpretation put upon them.

The statements of academic psychology often seem to imply that logical thinking is a continuous function of the mature person — that the sufficiently normal infant develops from syncretism and non-logic to logic and skilled performance. Such a description seems to be supported by much of the work of Piaget, of Claparede, and, with respect to the primitive, by Levy-Bruhl. If one examines the facts with care, either in industry or in clinic, one finds immediately that this implication, so flattering to the civilized adult, possesses only a modicum of truth. Indeed, one may go further and say that it is positively misleading.

What social and industrial research has not sufficiently realised as yet is that... minor irrationalities of the “average normal” person are cumulative in their effect. They may not cause “breakdown” in the individual but they do cause “breakdown” in the industry.