To apply and refine multidimensional and other computer aided techniques of multivariate data analysis to all House of Commons divisions in 13 parliamentary sessions from 1861 to 1926. To determine the level of consistency and strength in party and other Commons groupings. To test existing assumptions of party development and legislative behaviour. To design powerful and economic techniques of data management and analysis. To compile a comprehensive machine-readable source for the study of British politics in the period. Variables House of Commons voting in all divisions in the parliamentary divisions in 13 parliamentary sessions from 1861 to 1926. To 1881, 1886, 1891, 1896, 1901, 1911, 1916, 1921 and 1926. Biographical data Commons groupings. To test existing assumptions of party development to vote in those sessions. Subject categorization of those divisions.