A membership-based organization (MBO) represents a population of individuals or organizations that voluntarily join together to promote and protect their mutual interests. These organizations exist within the nonprofit sector.
The membership in these organizations is self-selected but can be limited to some extent by membership qualifications. These qualifications vary tremendously from those with a simple interest in the domain of the organization to those who must meet specific requirements such as an advanced degree, exten-sive experience, or to be widely published in the field. All require dues to become a full and active member.
A network of relationships, based upon a common set of interests and a willingness to take on a known set of responsibilities, hold these organizations together. These membership characteristics create a "relation-centered membershipÔ." The needs of the individual and the organization are met through vital connections and the exchange of valid and reliable information.