the party whips, as chosen by the Select Committee of Selection. The fourteen new committees began working effectively in 1980 after the 1979 general election. In the House of Commons The post-1979 system is made up of three main types of committee. Departmental committees shadow each of the main government departments – for example the Education Select Committee shadows the Department for Education. A number of committees work on general themes which are not the responsibility of any single department – for example, the Science and Technology Select Committee, and Women and Equalities Select Committee. Another group of committees deal with the internal affairs of the House (for example, the Procedure Select Committee and Standards and Privileges Select Committee). Rarely, there are also select committees of the Commons (and sometimes joint standing committees) that are tasked with the detailed analysis of individual bills. Most bills are referred, since the 2006–07 session, to public bill committees, and before that, there were standing committees. The chairs of (the majority of) select committees have been elected by the house as a whole since June 2010: before that the members were appointed by their parties and chairs voted on solely by those members. The chairs of committees are allocated to political parties on the basis of their numerical strength in the House of Commons. Negotiations between party managers determine which party will hold which committee chair. By convention, the Public Accounts Committee is chaired by a member of the main opposition party, while the Treasury Select Committee is chaired by a member of the governing party. The remaining places on the committee are allocated in proportion to the numerical strength of the parties in the House of Commons. These positions are filled by votes conducted within party caucuses. This means that positions on select committees are only ever contested among members of the same party. The standard number of members on a departmental committee is 11, although some committees such as Public Accounts have a larger membership. In July 2005, the Administration Select Committee was instituted, replacing the five 'domestic' committees which had been responsible for the consideration of services provided for the House in the Palace of Westminster from 1991 to 2005. It deals with issues as diverse as catering services, the House of Commons Library, digital services provision, and visitor services. The powers of Select Committees in the Commons are governed by