In sensitive social service contexts—such as counseling sessions or legal aid consultations—the notes taken during a meeting often contain highly confidential information that should not be visible to every user in the Salesforce org.

The Interaction Summary object (and its parent, the Interaction object) is specifically designed to meet this requirement in the modern Nonprofit Cloud.

Key Benefits of Interaction Summaries:

Structured Note Taking: Unlike standard Notes, which are essentially free-form text blobs, Interaction Summaries provide a structured container for documenting the "Who, When, Where, and What" of a meeting.

Confidentiality via CDS: The most critical feature for this organization is that Interaction Summaries natively support Compliant Data Sharing (CDS). A consultant can configure the system so that the meeting notes are restricted by default. Access can then be granted only to specific "Participants" (e.g., the Lead Caseworker and the Supervisor) based on their roles.

Holistic View: Interaction Summaries can be linked to multiple objects simultaneously, such as the Person Account and the Case Proceeding, ensuring the note appears in all relevant contexts without duplicating data.

Searchability: Because they are structured records, they are easier to filter and report on than standard Activity records or Notes.

Why other options are incorrect:

Standard Notes (Option B): These lack the role-based compliance framework provided by CDS and are harder to manage for professional casework auditing.

Activities (Option C): Standard Tasks and Events are better suited for "reminders" and "calendar entries." They do not offer the granular data sharing controls required for the sensitive documentation of case conversations.