Game design process: a graphic approach

A good graphic reference for game designers from the Jesse Schell's book "The art of game design" (2008, p.463). Check the content below (sorry for the bad resolution):

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SCHELL, Jesse. The art of game design. Burlington: Elsevier, 2008.

The importance of feedback loops (infographic)

The relationship among achievements, rewards, and power

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Source:

ADAMS, Ernest. Fundamentals of Game Design. New Riders: 2009. p.385