CTET Class I to V 2015 Sep Paper

(d) In the 1950s, a husband and wife team of Dutch educators, Pierre van Hiele and Dina van Hiele-Geldof, developed a theory of how children learn geometry which is still widely accepted today. Through their research, they identified five levels of understanding spatial concepts through which children move sequentially on their way toward geometric thinking. A visual image of the Van Hiele Theory is shown in