Sociology studies the causes and effects of the participation of individuals in groups and structured organisations. It has attracted the attention of those jurists who see law as a reflection of human beliefs and behaviour and as a product of certain types of social organisation. Hence, there has emerged a body of jurists who have turned increasingly to a study of the data produced by sociologists. Three prominent sociologists and jurists are singled out here for attention: Jhering (1818-1892), Weber (1864-1920) and Pound (1870-1964). The outlines of their contribution to the sociological movement in jurisprudence should be known.