My organization is ACCME accredited. We are working with another ACCME-accredited provider to offer a CME activity. My organization is taking responsibility for the activity's compliance with the ACCME's Accreditation Criteria and polices and the accreditation statement that we've included on our activity-related materials reflects that. Since the other accredited provider's name is not mentioned in the accreditation statement, how can I acknowledge their involvement in the activity?

The decision regarding how you acknowledge their involvement or what words to use is up to you. See the ACCME's policies regarding the accreditation statement for a copy of the accreditation statement.