Fig.1

‘Man responds to social situations with repetitive patterns. The same situation, recognized in its identity with previous situations, evokes the same response. The mind, as it were, holds in readiness a number of patterns appropriate for different situations; it then only requires only the identification of a particular case to apply to it the preformed pattern appropriated to it. Thus the human mind follows the principle of economy of effort, obviating an examination de novo of each individual situation and the pattern of thought and action appropriated to it. Yet when matters are subject to dynamic change, traditional patterns are no longer appropriate; they must be replaced by new ones reflecting such change. Otherwise a gap will open between traditional patterns and new realities, and thought and action will be misguided.'

Morganthau.