The Transtheoretical Model or Stages of Change was developed by James O. Prochaska and Carlo Di Clemente in 1977.  It outlines the different stages a person goes through to make a health behavior change, hence the reason it is also called “Stages of Change”.  It starts by the person not being ready to make a change to the final stage of dropping the old behavior in favor of a new one.  Here is what the model looks like:

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