Difficulty of engagement
Difficulty of engagement is a notion in the Campbell paradigm, a model of behavior change with person-independent difficulty.
Motivation
Difficulty is considered a key predictor of behavior in psychology and is included in most recognized models of behavior change, such as the theory of planned behavior. Most of these models rely on people's perceptions and estimates of behavioral difficulty. That is, difficulty is considered to be subjective and person-dependent. Obviously, perceived difficulty varies by individual.A more objective measure of difficulty is desirable, e.g., for environmental or energy policy, because people may misperceive the difficulty of behaviors, possibly because affected by mood or current circumstances.