Non-Functional Requirements for a Diabetes Management App

1️⃣ Performance Requirements

These define how quickly and efficiently the app should operate.

Examples:

  • The dashboard must load within 2 seconds on devices with at least 3GB RAM.

  • The app must process and save a new blood sugar entry within 1 second of submission.

  • Blood sugar data from connected glucometers must sync with the app within 5 seconds.

  • The app must handle up to 50 simultaneous API calls without significant delay (>200ms).

2️⃣ Security Requirements

These ensure protection of patient data and compliance with healthcare standards.

Examples:

  • All patient data must be encrypted using AES-256 during storage and transmission.

  • Users must be automatically logged out after 5 minutes of inactivity.

  • Access to sensitive data must require multi-factor authentication (MFA).

  • The app must log all data access events for auditing purposes, retaining logs for at least 1 year.

3️⃣ Usability Requirements

These ensure the app is user-friendly, especially for non-technical patients.

Examples:

  • The app must provide a simple, step-by-step tutorial during first-time use.

  • The app must support voice commands for logging blood sugar levels.

  • The app must allow font size adjustment for users with visual impairments.

  • The app must use color-coded indicators (e.g., green, yellow, red) for blood sugar levels (normal, caution, critical).

4️⃣ Reliability Requirements

These ensure the app is dependable and minimizes downtime or errors.

Examples:

  • The app must have an uptime of at least 99.9% over a 12-month period.

  • Data entered offline must sync automatically within 2 minutes of internet reconnection.

  • The app must save a backup copy of all user data every 24 hours.

  • The app must recover from crashes automatically within 10 seconds, without requiring user intervention.

5️⃣ Maintainability Requirements

These ensure the app can be easily updated, fixed, or enhanced.

Examples:

  • The app’s codebase must follow modular architecture to allow independent updates to features.

  • New bug fixes must be deployable within 48 hours of issue identification.

  • The app must support over-the-air (OTA) updates without requiring manual downloads by users.

  • All APIs used in the app must be version-controlled to allow backward compatibility.

6️⃣ Scalability Requirements

These ensure the app can handle increasing user load and data without issues.

Examples:

  • The app must support up to 50,000 concurrent users without degradation in performance.

  • The backend must handle up to 10 million data entries (blood sugar logs) without requiring major infrastructure changes.

  • The app must scale horizontally by adding additional servers as needed during peak usage times.

  • The app must support simultaneous data input from up to 10 different devices per user account.

7️⃣ Portability Requirements

These ensure the app works across different devices and platforms.

Examples:

  • The app must run on Android (version 9.0 and above) and iOS (version 13 and above).

  • The app must maintain consistent UI/UX across smartphones and tablets, regardless of screen size.

  • The app must function on devices with at least 2GB of RAM.

  • The app must support dark mode and light mode on all supported devices.


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