One model of thinking and decision-making is the theory of planned behavior which was developed by Ajzen in 2006?. Ajzen wanted to determine the different factors that persevere people in completing their plans and goals. This model shows how humans can change a behavior such as overcoming an addiction. It proposes that behavior is controlled by intentions. Intentions differentiate in strength and are influenced by three components: beliefs about a behavior, subjective norms about that behavior, and beliefs about how one can control that behavior. These factors play a part in one’s intention to implement the planned behavior. When the belief and subjective norm is commendatory and advantageous, there is a greater perceived control. Therefore, the person has a stronger intention to carry out the behavior.For example, Tory plans to quit smoking. She acknowledges smoking is bad for her health and bad for health in general. Societal norms emphasize that smoking is hazardous to one’s health, and most public places are designated smoke-free zones. Furthermore, some of her friends that are former smokers have successfully quit smoking and attend special support group meetings. She knows her family would encourage and support her efforts to quit smoking. She feels positive about abstaining from smoking and feels comfortable to attend a support group where people share similar stories and backgrounds as Tory. Tory is motivated and believes she can keep up with the twelve steps of the support program. Tory doesn’t worry about costs because the program is free. Conveniently, there is a location near her house, and she can attend the night meetings after work. In Tory’s case, the belief and the subject norm are more favorable because she knows that smoking is a global problem and acknowledges that she isn’t alone in this. She believes that she has a high chance for succeeding because her friends and family strongly support her decision to quit smoking, and she will attend meetings with a group of people who understand and share similar forms of the harmful behavior. According to the model, because of the favorable belief and subject norm and the great perceived control, she has a stronger intention and very high change in accomplishing her goal.In situations like the one above, the theory of planned behavior can help explain the process that led to a certain behavior which can therefore help society create appropriate programs to help people change those certain behaviors. This model is advantageous, and one strength is that the model describes the correlations between the actual behavior and the intentions to modify that behavior. The model considers and provides reasoning on factors such as emotions and the social environment that could influence one’s beliefs about their control over a behavior. Although, this model has been used in real life situations such as to help people get fit, lose weight, and quit smoking, there are some weaknesses. A limitation is that it may not entirely give reasoning on the role of emotions.