Head work refers to intellectual or mental efforts that require concentration, analysis and critical thinking. Several synonyms can be used interchangeably for head work, such as mental exertion, brainpower, cognitive task, analytic thinking and reasoning. Other related terms could include problem-solving, contemplation, deliberation, and strategic planning. In academic settings, head work can be colloquially described as a mental workout, thought process, or mental gymnastics. In a more general sense, head work can refer to intellectual stimulation or being mentally challenged. These synonyms all suggest a level of mental effort and critical thinking required to complete tasks that require intellectual abilities, revealing the importance of intellectual abilities in everyday life.