A standard is neither immutable nor absolute.
A standard can only be idealized in a relative sense - relative to our current state of knowledge. A standard is neither immutable nor absolute. Hence as our understanding of a concept increases, we change our formulation of how it ought to be observed and measured. This has been the case, for example, with respect to length. Wherefore, at this stage in the development of the behavioral sciences it is not necessary to develop ultimate (or even long lasting) definitional standards, but to provide some standards. We cannot hope to provide generally acceptable operational definitions of behavioral concepts, but we do hope to provide definitions that will provoke constructive discussion, leading to their rapid improvement. (PS 7-8)
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