The Interaction Summary object is a cornerstone of the modern Nonprofit Cloud, borrowed from the Financial Services Cloud architecture to support professional-grade relationship management.

One of the primary advantages of Interaction Summaries over standard Salesforce "Notes" or "Activities" is the ability to relate a single set of notes to multiple participants and entities.

Configuration and Usage:

The Interaction: Represents the meeting itself (the "Event").

The Interaction Summary: This is the record where the detailed, often sensitive, notes are stored.

Multiple Individuals: Using the Interaction Participant related list, a consultant can link the summary to multiple Person Accounts. For example, if a caseworker meets with a mother and her two children, a single Interaction Summary can be created and then related to all three individual records. This ensures that the meeting notes appear on the "Timeline" and "Related Lists" for every person involved without the caseworker having to copy and paste the notes three times.

Confidentiality: Because these summaries often contain sensitive case data, they are designed to work with Compliant Data Sharing (CDS). This allows the consultant to ensure that while the note is linked to multiple people, only staff with the correct "Participant Role" can actually read the contents.

Why other options are incorrect:

Action Plans (Option B): These are used for tracking a series of tasks or checklists (e.g., "Steps to complete intake"). They are not a note-taking or conversation-tracking feature.

Outreach Summaries (Option C): This object is used in Fundraising to roll up the performance of a specific marketing campaign (e.g., total gifts and donor count from a direct mail appeal); it has no relation to client conversations or case notes.