<P> The name hygiene factors is used because, like hygiene, the presence will not improve health, but absence can cause health deterioration . </P> <P> Herzberg's theory has found application in such occupational fields as information systems and in studies of user satisfaction such as computer user satisfaction . </P> <P> Alderfer, expanding on Maslow's hierarchy of needs, created the ERG theory . This theory posits that there are three groups of core needs--existence, relatedness, and growth, hence the label: ERG theory . The existence group is concerned with providing our basic material existence requirements . They include the items that Maslow considered to be physiological and safety needs . The second group of needs are those of relatedness - the desire we have for maintaining important personal relationships . These social and status desires require interaction with others if they are to be satisfied, and they align with Maslow's social need and the external component of Maslow's esteem classification . Finally, Alderfer isolates growth needs as an intrinsic desire for personal development . Maslow's categories are broken down into many different parts and there are a lot of needs . The ERG categories are more broad and covers more than just certain areas . As a person grows, the existence, relatedness, and growth for all desires continue to grow . All these needs should be fulfilled to greater wholeness as a human being . These include the intrinsic component from Maslow's esteem category and the characteristics included under self - actualization . </P> <P> Since the early 1970s Edward L. Deci and Richard M. Ryan have conducted research that eventually led to the proposition of the self - determination theory (SDT). This theory focuses on the degree to which an individual's behaviour is self - motivated and self - determined . SDT identifies three innate needs that, if satisfied, allow optimal function and growth: competence, relatedness, and autonomy . </P>

The basic forces that motivate a person to do something to sustain biological life
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