

These 'Service Groups' all have their own national and regional democratic structures within UNISON's constitution. The majority of people joining UNISON would be workers within areas such as local government, education, the National Health Service, police services, utilities (such as gas, electricity and water), and transport. Members of UNISON are typically from industries within the public sector and generally cover both full-time and part-time support and administrative staff. He was elected on 28 February 2000 and took up the post on 1 January 2001, succeeding Rodney Bickerstaffe who had held the post for five years.

UNISON's current general secretary is Dave Prentis. The union was formed in 1993 when three public sector trade unions, the National and Local Government Officers Association (NALGO), the National Union of Public Employees (NUPE) and the Confederation of Health Service Employees (COHSE) merged. UNISON is the second largest trade union ( Unite being the largest) in the United Kingdom with over 1.3 million members. TUC, STUC, ICTU, ETUC, ( EPSU), ITUC, ( PSI), Labour Party For other uses, see Unison (disambiguation). In unison, in agreement agreeing in tone in concord. A piece or passage is said to be sung or played in unison when all the voices or instruments perform the same part, in which sense unison is contradistinguished from harmony. Unison, then, consists in identity of pitch alone, irrespective of quality of sound, or timbre, whether of instruments or of human voices. Sounds of very different qualities and force may be in unison, as the sound of a bell may be in unison with a sound of a flute. ☞ If two cords of the same substance have equal length, thickness, and tension, they are said to be in unison, and their sounds will be in unison. Parts played or sung in octaves are also said to be in unison, or in octaves. (Mus.) Identity in pitch coincidence of sounds proceeding from an equality in the number of vibrations made in a given time by two or more sonorous bodies.
