Kelly's range corollary assumes that personal constructs are finite and not relevant to everything. "A construct is convenient for the anticipation of a finite range of events only" (Kelly, 1955, p. 68). In other words, a construct is limited to a particular range of convenience.
The construct independence was within Arlene's range of convenience when she was deciding to buy a car, but on other occasions independence would be outside those boundaries. Independence carries with it the notion of dependence. Arlene's freedom to remain in school, freedom to continue her job, and freedom to move quickly from place to place without relying on others all fall within her independence/dependence range of convenience. However, Arlene's construct of independence excludes all irrelevancies such as up/down, light/dark, or wet/dry; that is, it is convenient only for a finite range of events.
The range corollary allowed Kelly to distinguish between a concept and a construct. A concept includes all elements having a common property, and it excludes those that do not have that property. The concept tall includes all those people and objects having extended height and excludes all other concepts, even those that are outside its range of convenience. Therefore, fast or independent or dark are all excluded from the concept tall because they do not have extended height. But such exclusions are both endless and needless. The idea of construct contrasts tall with short, thus limiting its range of convenience. "That which is outside the range of convenience of the construct is not considered part of the contrasting field but simply an area of irrelevancy" (Kelly, 1955, p. 69). Thus, dichotomies lhnit a constructs range of convenience.
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