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Range and Focus of Convenience

From Kelly (1963):

"A range of convenience is that expanse of the real world over which a given system or theory provides useful coverage." [p. 17]

"There are, of course, various psychological construction systems. These systems differ primarily because the people who developed them were focusing their attention upon somewhat different events." [p. 18]

"Psycological systems have not only ranges of convenience but also characteristic foci of convenience: points at which they are particularly applicable." [p. 18]
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