As the number of political parties has fallen, that of pressure groups has increased. In the voluntary sector alone, one third of the population is involved in regular work for organisations, several of which can be described as a pressure group. They are organised groups that don't put up candidates for election, but seek to influence government policy or legislation. These organisations are also described as interest groups, lobby groups, or protest groups. The term pressure group can inadvertently be interpreted as groups that use actual pressure to achieve their aims.
The term pressure group does not clearly distinguish between the groups that fall under the term. There is a huge range of pressure groups, covering politics, business, employment, ethnic minorities, health, defence, religion, foreign relations, animal welfare, social welfare, environment, consumers. The numbers of members from these groups can range from a million members to those with a dozen. One example is the Countryside Alliance which has 105,000 full members plus 250,000 associate members through affiliated clubs and societies. Coxall, Lynton & Leach (2003, p136) argues that pressure groups are vital institutions in our modern democratic society. In the 1970s and 1980s there was proliferation of pressure groups particularly connected with environmental issues, ranging from global pollution problems to protecting particular animals.
There are key characteristics that classify pressure groups. The sectional/cause division is the first step in categorizing the groups.
Sectional groups represent the interests of a precise section of society, existing to further the interests of people as engaged in certain occupations. Members of sectional pressure groups are directly and personally concerned with the outcome that the group is fighting for, as they stand to gain professionally and economically. The British Medical Association (BMA), and the