The Visualization level (Level 1, also
known as the level of recognition) in
which students recognize and learn to
name certain geometric shapes but are
usually only aware of shapes as a whole, a
– The Analysis level (Level 2, also known as
descriptive) students begin to recognize
shapes by their properties.
– The Abstraction level (Level 3, also known
as relational), students begin to form
definitions of shapes based on their
common properties, and to understand
some proofs.