The number of job factors that influence pay levels is almost limitless. However, the most important ones are those-associated with skill, responsibility, and effort/ Skill factors include both mental and physical skills, including the education, training, and preparation necessary to acquire those skills. Jobs that involve a great deal of responsibility usually receive higher pay, regardless of whether the responsibility concerns physical assets, financial assets, human resources, or company goodwill. Pay levels are also higher for jobs that require more physical or mental effort. The influence of working conditions, however, is minor unless the conditions become extremely unpleasant or hazardous. The most important individual factors are productivity and seniority