Yes, ACOs and CPs may engage any TA Vendor in the Vendor Catalog to work with them in any area that they chose. Please note, however, that TA Vendors were approved for the Vendor Catalog based on their demonstrated experience and expertise in distinct TA Domains. Please also note that MassHealth and Abt Associates must approve all TA applications and negotiated scopes of work and budgets prior to the start of any TA project work.