Abstract
Recent research in education, and mathematics education in particular, has led to the identification of
independent categorizing systems intended to mirror the structures found in such diverse fields as teacher
professional development (Barnett, 1992); student writing in mathematics (Clarke, Stephens, & Waywood,
in press); and student acquisition of calculus knowledge (Frid, 1992). There are particular characteristics of
these categorizing systems which display a tantalising similarity:
• Contextual similarity - the common location of all three studies within educational environments;
• Structural similarity - the "three-valued"(triadic) structure of all three categorizing systems;
• Conceptual similarity - categories in each system resemble each other in the nature of their conceptual
distinctions.
This degree of similarity suggests that each categorizing system is an independent manifestation of a more
fundamental triadic system (TRIADS). This paper examines the characteristics of these triadiC systems and
makes comparison with other systems (or analytical frameworks) found in the research or theoretical
literature. in an attempt to establish the significance of the degree of conceptual similarity found in the
categorizing systems employed in mathematics education. It is proposed that cognitive sophistication be
identified with personally contextualized knowledge rather than with formally abstracted knowledge.
TRIADS is proposed as a robust structure having relevance in a variety of educational contexts. It is also
proposed that conceptual similarities between the first two levels of TRIADS and Skemp's (1976) diadic
structure for mathematical understanding support the addition of a third level to be called Contextual
Understanding.
DA VID CLARKE, SANDRA FRID, & CARNE BARNETT
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