who has not fulfilled their responsibilities may feel a sense of anxiety and regret for not performing well. They may also feel dejection due to not being able to achieve their hopes and aspirations. According to this theory, all individuals will learn what their obligations and responsibilities are for a particular function, and if they fail to fulfill those obligations then they are punished. Over time, these duties and obligations consolidate to form an abstracted set of principles, designated as a self-guide. Agitation and anxiety are the main responses when an individual fails to achieve the obligation or responsibility. This theory also explains that if achievement of the obligations is obtained then the reward can be praise, approval, or love. These achievements and aspirations also form an abstracted set of principles, referred to as the ideal self guide. When the individual fails to obtain these rewards, they begin to have feelings of dejection, disappointment, or even depression. Two-factor theory (motivator-hygiene theory) Frederick Herzberg's two-factor theory (also known as motivator-hygiene theory) attempts to explain satisfaction and motivation in the workplace. This theory states that satisfaction and dissatisfaction are driven by different factors – motivation and hygiene factors, respectively. An employee's motivation to work is continually related to job satisfaction of a subordinate. Motivation can be seen as an inner force that drives individuals to attain personal and organizational goals. Motivating factors are those aspects of the job that make people want to perform, and provide people with satisfaction, for example achievement in work, recognition, promotion opportunities. These motivating factors are considered to be intrinsic to the job, or the work carried out. Hygiene factors include aspects of the working environment such as pay, company policies, supervisory practices, and other working conditions. Herzberg's model has stimulated much research. In the 1970s, researchers were unable to reliably empirically prove the model however, with Hackman & Oldham suggesting that Herzberg's original formulation of the model may have been a methodological artifact. However, emerging studies have a new-found interest in the theory, particularly among employees in the public sector and among certain professions such as nurses. The theory has been criticized because it does not consider individual differences, conversely predicting all employees will react in an identical manner to changes in motivating/hygiene factors. The model has also been criticised in that it does not specify how motivating/hygiene factors are to be measured. Most studies use