types of membership models
Single-tier membership model: here, the NGO has one level of membership, where all members have identical rights and responsibilities. The members are comprised of individuals or organizations. Multi-tier membership model: Several levels of membership comprised of a variety of organizations.
The structure of NGOs worldwide takes a number of forms depending on various aspects (see for example, Keywords and Concepts associated with NGOs). The following is a selection of models that define the membership structure of NGOs. 1  Exclusive membership model: In this model, a small number of clients or member organizations pay a substantial up-front fee and an on-going amount to fund the NGO in return for implementing a project or conduct research.