Sociology is the study of society, patterns of social relationships, social interaction and culture of everyday life using the principles of psychology neuroscience and network science. It is a social science that uses various methods of empirical investigation and critical analysis to develop a body of knowledge about social order, acceptance, and change or social evolution. While some sociologists conduct research that may be applied directly to social policy and welfare, others focus primarily on refining the theoretical understanding of social processes. Subject matter ranges from the micro-sociology level of individual agency and interaction to the macro level of systems and the social structure. The different traditional focuses of sociology include social stratification, social class, social mobility, religion, secularization, law, sexuality, gender, and deviance. As all spheres of human activity are affected by the interplay between social structure and individual agency, sociology has gradually expanded its focus to other subjects, such as health, medical, economy, military and penal institutions, the Internet, education, social capital, and the role of social activity in the development of scientific knowledge. The range of social scientific methods has also expanded. Social researchers draw upon a variety of qualitative and quantitative techniques. The linguistic and cultural turns of the mid-20th century led to increasingly interpretative, hermeneutic, and philosophic approaches towards the analysis of society. Conversely, the end of the 1990s and the beginning of the 2000s have seen the rise of new analytically, mathematically, and computationally rigorous techniques, such as agent-based modelling and social network analysis. Social research informs politicians and policy makers, educators, planners, legislators, administrators, developers, business magnates, managers, social workers, non-governmental organizations, non-profit organizations, and people interested in resolving social issues in general. There is often a great deal of crossover between social research, market research, and other statistical fields. Sociological reasoning predates the foundation of the discipline. Social analysis has origins in the common stock of Western knowledge and philosophy, and has been carried out from as far back as the time of ancient Greek philosopher Plato, if not before. The origin of the survey (the collection of information from a sample of individuals) can be traced back to at least the Domesday Book in 1086, while ancient philosophers such as Confucius wrote about the importance of social roles. There is evidence of early sociology in medieval Arab writings. Some sources consider Ibn Khaldun, a 14th-century Arab Islamic scholar from North Africa (Tunisia), to have been the first sociologist and the father of sociology (see Branches of the early Islamic philosophy); his Muqaddimah was perhaps the first work to advance social-scientific reasoning on social cohesion and social conflict. The word sociology (or 'sociologie') is derived from both Latin and Greek origins. The Latin word: socius, 'companion'; the suffix -logy, 'the study of' from Greek -λογία from λόγος, lógos, 'word', 'knowledge'. It was first coined in 1780 by the French essayist Emmanuel-Joseph Sieyès (1748–1836) in an unpublished manuscript. Sociology was later defined independently by the French philosopher of science, Auguste Comte (1798–1857) in 1838 as a new way of looking at society. Comte had earlier used the term social physics, but that had subsequently been appropriated by others, most notably the Belgian statistician Adolphe Quetelet. Comte endeavoured to unify history, psychology, and economics through the scientific understanding of the social realm. Writing shortly after the malaise of the French Revolution, he proposed that social ills could be remedied through sociological positivism, an epistemological approach outlined in The Course in Positive Philosophy (1830–1842) and A General View of Positivism (1848). Comte believed a positivist stage would mark the final era, after conjectural theological and metaphysical phases, in the progression of human understanding. In observing the circular dependence of theory and observation in science, and having classified the sciences, Comte may be regarded as the first philosopher of science in the modern sense of the term. Both Auguste Comte and Karl Marx (1818–1883) set out to develop scientifically justified systems in the wake of European industrialization and secularization, informed by various key movements in the philosophies of history and science. Marx rejected Comtean positivism but in attempting to develop a science of society nevertheless came to be recognized as a founder of sociology as the word gained wider meaning. For Isaiah Berlin, Marx may be regarded as the 'true father' of modern sociology, 'in so far as anyone can claim the title.' Herbert Spencer (27 April 1820 – 8 December 1903) was one of the most popular and influential 19th-century sociologists. It is estimated that he sold one million books in his lifetime, far more than any other sociologist at the time. So strong was his influence that many other 19th-century thinkers, including Émile Durkheim, defined their ideas in relation to his. Durkheim's Division of Labour in Society is to a large extent an extended debate with Spencer from whose sociology, many commentators now agree, Durkheim borrowed extensively. Also a notable biologist, Spencer coined the term survival of the fittest. While Marxian ideas defined one strand of sociology, Spencer was a critic of socialism as well as strong advocate for a laissez-faire style of government. His ideas were closely observed by conservative political circles, especially in the United States and England.