Sociology is the scientific study of human social life, groups and societies. Key figures in the development of sociology include Ibn Khaldun, considered one of the founders of modern historiography; Auguste Comte who proposed applying the scientific method to social phenomena; Herbert Spencer who believed society operates under fixed laws; and Karl Marx who introduced the conflict perspective focusing on class conflict. Other important early sociologists were Emile Durkheim who identified the role of social integration and Max Weber who examined the influence of social groups on people's orientations.