This document defines work and discusses its classifications, elements, and dimensions. It provides several definitions of work, including physical or mental effort directed toward production, and using one's strengths and skills in a useful way. Work is classified as either mental (utilizing thinking and reasoning) or physical (involving muscles). It also identifies the key elements of work as will power, objectives, responsibility, and knowledge. Work has both objective and subjective dimensions, and has ethical value when performed by a conscious and free person.