Diffusion of Innovation Theory

https://sphweb.bumc.bu.edu/otlt/MPH-Modules/SB/BehavioralChangeTheories/BehavioralChangeTheories4.html

This theory has been used successfully in many fields including communication, agriculture, public health, criminal justice, social work, and marketing.

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more on instructional design in this IMS blog
https://blog.stcloudstate.edu/ims?s=instructional+design