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unidimensional scales

"
the general
boundaries of the domain are initially established, but the process is not complete until a set of
essentially unidimensional measurement scales is developed, which together define the scope
and boundaries of the domain of learning and growth.
Because perfect unidimensionality is
impossible to achieve, we must settle for essential, or near, unidimensionality. Delineating a
domain to a point where essential unidimensionality in each of a small set of domain-spanning
scales is achieved is not always accomplished in practice, as it is often a time-consuming and
lengthy process.


Constructing a set of domain-spanning measurement
scales elevates a good qualitative model of a domain to a theory." (Bunderson 2003, p. 5)
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