For committees which are 'joint' or 'mixed' in composition, a membership of 9-11 may be about right. Committees vary considerably in size, and the best size will depend on the nature and purpose of the particular committee. One advantage of a small committee is that each member has more chance to speak and to ensure that group decisions are implemented to his satisfaction. People are normally chosen to serve on business committees either by virtue of the position that they hold, for example, Personnel Manager, or because they are regarded as particularly suitable to serve on the committee. Any member of a committee should be able to contribute some relevant knowledge or experience to its deliberations. Under skilful Chairmanship, it is to be expected that the members of any committee will quickly get to know each other and work happily together.