Instructional Development Timeline
Edgar Dale

 

  • Edgar Dale (1900 – 1985) developed the "Cone of Experience," in 1946.  It provided an intuitive model of the concreteness of various audio-visual media. The purpose of the cone was to provide a visual example of various teaching levels and materials.

Dale's Cone

 

 

Sources

 

Wikipedia: Edgar Dale

Instructional Resources to Enhance Instruction