Consulting Engineers South Africa (CESA) is a voluntary association and represents for its members a body that promotes their joint interests and because of its standing, provides quality assurance for clients. Over 540 firms employing over 21 000 staff are members of CESA; these member firms range from large, multinational, multidisciplinary suppliers of a comprehensive range of planning, design and project delivery services, to many small- to medium-sized firms that tend to specialise in selected areas of the project delivery process.