English to Portuguese Other Accounting Accounting/Auditing

A expressão aparece num documento sobre contabilidade e auditoria

1.1.3. The Finance, Risk, and Audit Committee oversee the combined risk-assurance model in order to maximise time and cost savings for the company from its assurance providers. Combined assurance is about assurance providers (internal and external) working more closely together to ensure the following:

1.1.3.1. Communication and setting key outcomes of combined assurance;
1.1.3.2. Assurance in the right areas is obtained;
1.1.3.3. Assurance is obtained from the right resources;
1.1.3.4. Assurance is obtained in the most cost-effective way possible

Eu estava a considerar *PROVEDORES DE GARANTIAS* mas essa expressão não ocorre no contexto de auditoria....a minha pesquisa leva me às GARRANTIAS BANCÁRIAS mas também não me parece que seja o caso.