Prosci ADKAR is a model, not a methodology.

"...a model gives you a simplified view or a snapshot of a complex process system. A methodology offers a complex process, procedures, approaches, guardrails, and best practice to guide decision-making and problem-solving at the individual or group level..."
Andrew Horlick, 2023

However, the ADKAR model is an important part of the Prosci methodology.


(source: Andrew Horlick, 2023)