Researchers have found high levels of stress among individuals who have excessive work-loads. Long or unpredictable hours, too many responsibilities, work at a too-rapid pace, too many phone calls, dealing directly with difficult people without sufficient relief, dealing with constant crises, and supervising too many people (e.g., large class sizes and overcrowding) or having broad multifaceted job descriptions are characteristics of a work overload. In addition, boring tedious jobs or jobs without variety are equally distressful.