The Umbrella organization reference article from the English Wikipedia on 24-Jul-2004
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Umbrella organization

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An umbrella organization is an association of (often related, industry specific) institutions, who work together formally to coordinate activities or pool resources. In business, political, or other environments, one group, the umbrella organization, provides resources and often an identity to the smaller organizations. Often in this kind of arrangement, the umbrella organization is to some degree responsible for starting the groups under its care. Compare to Franchises and Subsidiaries.

There may be many reasons for establishing/joining an umbrella organization;

Example Organizations