Leisure has been defined as a quality of experience or as free time. Free time is time spent away from business, work, job hunting, domestic chores and education. It also excludes time spent on necessary activities such as eating and sleeping. From a research perspective, this approach has the advantages of being quantifiable and comparable over time and place. Leisure as experience usually emphasizes dimensions of perceived freedom and choice. It is done for "its own sake", for the quality of experience and involvement. Other classic definitions include Thorsten Veblen's (1899) of "nonproductive consumption of time." Different disciplines have definitions reflecting their common issues: for example, sociology on social forces and contexts and psychology as mental and emotional states and