The acronym APOS stands for Action, Process, Object, and Schema. APOS Theory is a theory of how mathematical concepts can be learned. Rooted in the work of Jean Piaget, its fundamental ideas were first introduced in the early 1980s (Dubinsky 1984), and since that time, extensive development and application have been carried out by researchers, curriculum developers, and teachers in many countries throughout the world.
KeywordsMathematical Concept Curriculum Development Mathematics Education Research Middle School Teacher Curriculum Developer
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