Because it is less demanding to simply avoid a task instead of dealing with the possibility of failure, procrastinators choose the short-term gratification of delaying a task over the long-term uncertainty of undertaking it. Procrastination can also be a justification for when the user ultimately has no choice but to undertake a task and performs below their standard. For example, a term paper could be seen as a daunting task. If the user puts it off until the night before, they can justify their poor score by telling themselves that they would have done better with more time. This kind of justification is extremely harmful and only helps to perpetuate the cycle of procrastination. Over the years, scientists have determined that not all procrastination is the same. The first type is chronic procrastinators whom exhibit a combination of qualities from the other, more specialized types of procrastinators. "Arousal" types are usually self-proclaimed "pressure performers" and relish the exhilaration of completing tasks close to the deadline. "Avoider" types procrastinate to avoid the outcome of whatever task they are pushing back - whether it be a potential failure or success. "Avoider" types are usually very self-conscious and care deeply about other people's opinions. Lastly, "Decisional" procrastinators avoid making decisions in order to protect themselves from the responsibility that follows the outcome of events. Models of behavior change Social-cognitive models of behavior change include the constructs of motivation and volition. Motivation is seen as a process that leads to the forming of behavioral intentions. Volition is seen as a process that leads from intention to actual behavior. In other words, motivation and volition refer to goal setting and goal pursuit, respectively. Both processes require self-regulatory efforts. Several self-regulatory constructs are needed to operate in orchestration to attain goals. An example of such a motivational and volitional construct is perceived self-efficacy. Self-efficacy is supposed to facilitate the forming of behavioral intentions, the development of action plans, and the initiation of action. It can support the translation of intentions into action. John W. Atkinson, David Birch and their colleagues developed the theory of "Dynamics of Action" to mathematically model change in behavior as a consequence of the interaction of motivation and associated tendencies toward specific actions. The theory posits that change in behavior occurs when the tendency for a new, unexpressed behavior becomes dominant over the tendency currently motivating action. In the theory, the strength