Doll's Model of Curriculum Development :pencil2: By William Doll :pencil2: The Four Rs: Richness, Recursion, Relations, Rigor :pencil2: Richness: depth of curricular content and experiences, intellectual investigating :pencil2: communal discovery, imagination, resourcefulness :pencil2: Recursion: spiral curriculum, looping back of various thoughts, each loop adds depth and richness :pencil2: Relations: Actions, connections, dynamic structure, chaotic relations, cultural relations :pencil2: Rigor: uncertainty principle of chaos theory, being aware of alternatives to what content and experiences are planned.