Several independent associations may want to speak together on a national issue without creating an organization that can routinely overrule them. A confederation gives them a common institution for selected purposes while keeping substantial power in the member bodies.
The Articles of Confederation offer a historical example of powers reserved to constituent states except where explicitly delegated. Reserving those powers protects member autonomy, while making the common body's capacity depend on what members are actually willing to delegate.
Coordination with reservations
A confederation of professional associations could coordinate public campaigns and share research while requiring member approval for financial commitments. This makes joining less threatening to existing organizations because their independence remains visible.
The same protection can make collective action fragile. A central office may announce a plan without the money or authority to deliver it. Members can benefit from joint advocacy while leaving others to fund the work, and repeated requests for local approval can slow urgent decisions.
The boundary between federation and confederation is not settled by the name alone. A useful description identifies what the common body can actually decide, how members are bound, and whether they can withdraw. Those details reveal whether the arrangement is a capable joint institution or primarily a venue for negotiating among continuing independent actors.