Social class is sometimes presented as a description of how members of the society have sorted themselves along a continuum of positions varying in importance, influence, prestige, and compensation. In these models, certain occupations are considered to be desirable and influential, while others are considered to be menial, repetitive, and unpleasant. (In some cases, non-occupational roles such as a parent or volunteer mentor, are also considered.) Generally, the higher the ranking on such a scale, the higher the skill and education levels required to perform it.