APOS theory
The main mental mechanisms for building the mental structures of action, process, object, and schema are
called interiorisation and encapsulation (Dubinsky, 2010; Weller et al., 2003). The mental structures of
action, process, object, and schema constitute the acronym APOS. APOS theory postulates that a
mathematical concept develops as one tries to transform existing physical or mental objects. The descriptions of action, process, object and schema; given below; are based on those given by Weller,
Arnon and Dubinsky (2009).
APOS theoryThe main mental mechanisms for building the mental structures of action, process, object, and schema arecalled interiorisation and encapsulation (Dubinsky, 2010; Weller et al., 2003). The mental structures ofaction, process, object, and schema constitute the acronym APOS. APOS theory postulates that amathematical concept develops as one tries to transform existing physical or mental objects. The descriptions of action, process, object and schema; given below; are based on those given by Weller,Arnon and Dubinsky (2009).
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