Define success metrics for health appointment reminder serving event organizers

Problem Statement Description

You are evaluating a health appointment reminder product used by event organizers who run scheduled health-related events such as vaccination drives, screenings, community clinics, wellness sessions, or employer health programs. Organizers create appointment slots, invite or register participants, and rely on reminders to reduce missed appointments and coordinate attendance.

The core business goal in this scenario is fraud prevention. Fraud could include fake organizers creating illegitimate events, fraudulent appointment registrations, duplicate or bot-driven bookings, abuse of reminder channels, misleading health-event communications, or attempts to harvest user data through appointment workflows. The product must protect participants and organizers while still allowing legitimate events and reminders to run smoothly.

Your task is to define how you would measure whether the reminder system is successful, with particular attention to whether it reduces fraud without damaging the legitimate appointment experience.

The experience should consider:

- The primary success metric for fraud prevention and what user/action population belongs in its denominator

- How to distinguish organizer-level, event-level, appointment-level, and reminder-level fraud signals

- Instrumentation needed across event creation, participant registration, reminder delivery, user interaction, reporting, and enforcement actions

- Cohorts such as new vs. trusted organizers, event type, geography, reminder channel, event size, and participant acquisition source

- Guardrail metrics for legitimate organizers and patients, including delivery reliability, appointment attendance, false positives, and support burden

- How to measure detection quality, enforcement outcomes, and post-action recurrence without relying only on reported fraud

- Decision usefulness: how the metrics would inform product changes, policy tuning, operational review, or launch readiness

The goal is to produce a clear metrics framework that helps the product team understand whether the appointment reminder experience is trustworthy, scalable, and effective at preventing abuse while preserving access to legitimate health appointments.