This document outlines the non-functional requirements for the fitness tracking application. These requirements define quality attributes and constraints that affect the overall user experience, performance, and security of the system.
Requirement: The application must provide responsive interaction and efficient data processing to ensure a smooth user experience across all supported devices.
Acceptance Criteria: - Application cold start time must be under 3 seconds on reference devices - UI interactions must respond within 100ms - Data processing operations should complete within 2 seconds - The application must maintain a steady frame rate of at least 30 fps
Scenario: NFR-01-S01 - Application startup time
Given the application is installed on a supported device
When I launch the application from a cold start
Then the splash screen should appear within 0.5 seconds
And the main screen should be fully loaded within 3 seconds# Test d'acceptation
Scenario: NFR-01-TA01 - Performance under low memory conditions
Given the device has less than 15% available memory
When I use the application for a complete workout session
Then the application should maintain frame rates above 30 fps
And should not crash due to memory constraints
And should provide appropriate feedback if performance degradation occurs# Test d'acceptation
Scenario: NFR-01-TA02 - Performance profiling across device tiers
Given we have test devices representing low, mid, and high-end hardware
When the performance test suite is executed on each device
Then all defined performance metrics should be within acceptable thresholds for the device tier
And any areas failing to meet performance targets should be documentedRequirement: The application must securely store user data, protect user privacy, and implement appropriate security measures to prevent unauthorized access.
Acceptance Criteria: - All sensitive user data must be encrypted at rest - Data transmission must use secure protocols - Authentication methods must follow platform best practices - User data must not be accessible to other applications
Scenario: NFR-02-S01 - Secure storage of personal information
Given I have entered my personal profile information
When the data is saved to device storage
Then sensitive information should be encrypted
And data should not be accessible to other applications
And encryption keys should be securely managedScenario: NFR-02-S02 - Optional cloud synchronization security
Given I have enabled cloud synchronization
When my workout data is transmitted to the cloud
Then the data should be sent over HTTPS
And access tokens should be securely stored
And no plaintext credentials should be stored on the device
And communications should use certificate pinning# Test d'acceptation
Scenario: NFR-02-TA01 - Data export security
Given I have selected to export my workout history
When I choose to share the exported file
Then the system should present a warning about data privacy
And sensitive personal information should be optionally excluded
And exported files should be encrypted with a user-provided password# Test d'acceptation
Scenario: NFR-02-TA02 - Security during application updates
Given I have sensitive user data stored in the application
When the application is updated to a new version
Then all security settings and encrypted data should remain intact
And encryption methods should be forward compatibleRequirement: The application must be usable by people with different abilities and provide an intuitive interface that follows platform design guidelines.
Acceptance Criteria: - The application must comply with WCAG 2.1 AA standards - User interfaces must follow platform design guidelines - The app must support system text size adjustments - Critical actions must be easily reachable in one-handed use
Scenario: NFR-03-S01 - Screen reader compatibility
Given I have enabled the device's screen reader
When I navigate through the application screens
Then all UI elements should be properly announced
And I should be able to complete a workout using only the screen reader
And focus order should follow logical interaction patternsScenario: NFR-03-S02 - Color contrast compliance
Given I am using the application with default theme
When I view any screen in the application
Then text elements should have a minimum contrast ratio of 4.5:1
And interactive elements should have a minimum contrast ratio of 3:1
And the app should respect system dark mode settingsScenario: NFR-03-S03 - One-handed operation
Given I am holding the device with one hand
When navigating through a workout session
Then I should be able to record sets and progress to next exercises
And critical controls should be reachable within the thumb zone
And gesture alternatives should exist for hard-to-reach actions# Test d'acceptation
Scenario: NFR-03-TA01 - Text scaling support
Given I have set my device font size to 150% of default
When I use the application
Then all text should remain readable and properly contained within its elements
And no important information should be cut off
And layouts should adapt appropriately to the larger text# Test d'acceptation
Scenario: NFR-03-TA02 - Usability testing with diverse users
Given we have a representative sample of target users with diverse abilities
When they perform core app functions in a usability test
Then at least 80% should complete tasks successfully without assistance
And the average System Usability Scale (SUS) score should be above 70Requirement: The application must efficiently use device resources to minimize battery consumption and heat generation during use.
Acceptance Criteria: - Background processing should be minimal when app is not in use - A complete 60-minute workout session should use less than 5% battery - The application should adapt behavior in low-battery situations - Battery usage statistics should be below similar apps in the category
Scenario: NFR-04-S01 - Background battery usage
Given the application is installed
When the application is not actively used for 24 hours
Then the total background battery consumption should not exceed 1% of device battery
And the app should appear below position 10 in system battery usage statistics# Test d'acceptation
Scenario: NFR-04-TA01 - Low battery mode adaptation
Given my device is in low battery mode
When I use the application for a workout
Then the app should disable non-essential features like animations
And should adjust sync frequency to conserve battery
And should offer a "battery saver" workout mode with minimal screen usage# Test d'acceptation
Scenario: NFR-04-TA02 - Energy usage benchmarking
Given standard testing conditions across reference devices
When standardized workout sessions are performed
Then our application should consume equal or less energy than benchmark competitor apps
And a full battery should support at least 10 complete workout sessionsRequirement: The application must maintain data integrity and provide reliable operation even under adverse conditions such as connectivity issues or unexpected termination.
Acceptance Criteria: - No user data should be lost due to crashes or unexpected terminations - The application should handle network transitions gracefully - Core functionality must work without an internet connection - Data synchronization must be robust against interruptions
Scenario: NFR-05-S01 - Workout execution in offline mode
Given I have previously synchronized workout programs
When I enable airplane mode on my device
And I open the application
Then I should be able to start and complete a saved workout
And all workout data should be stored locally
And no functionality should be blocked except for online-dependent featuresScenario: NFR-05-S02 - Data synchronization after offline period
Given I have completed 3 workouts while offline
When I reconnect to the internet
And I open the application
Then the app should synchronize my offline workout data
And no workout data should be lost
And any conflicts should be resolved according to defined merge strategiesScenario: NFR-05-S03 - Recovery from abnormal termination
Given I am in the middle of recording a workout
When the application process is forcibly terminated
And I relaunch the application
Then I should be prompted to resume my interrupted workout
And all previously recorded data should be preserved
And the application should return to a consistent state# Test d'acceptation
Scenario: NFR-05-TA01 - Extended offline operation
Given I have been using the app offline for 30 days
When I continue using the app for workout tracking
Then the app should handle the local data storage efficiently
And should not show performance degradation
And should successfully sync all data when connection is restored# Test d'acceptation
Scenario: NFR-05-TA02 - Database corruption recovery
Given the local database becomes corrupted
When the application detects the corruption during startup
Then it should attempt automatic recovery from backup
And if unsuccessful, guide the user through a recovery process
And recover as much data as possible from cloud backups if availableRequirement: The application must work consistently across supported platforms and integrate smoothly with other fitness ecosystems and devices.
Acceptance Criteria: - Must function on Android 9.0 (API level 28) and higher - Must support integration with health platforms (Google Fit, Apple Health) - Must provide consistent experience across different screen sizes - Must support common wearable devices for workout tracking
Scenario: NFR-06-S01 - Tablet layout optimization
Given I am using the app on a tablet device
When I view the workout execution screen
Then the layout should utilize the additional screen space effectively
And should show both current exercise details and upcoming exercises simultaneously
And should maintain a coherent visual hierarchyScenario: NFR-06-S02 - Adaptation to different screen dimensions
Given I rotate my device from portrait to landscape orientation
When viewing any screen in the application
Then all content should remain accessible and properly formatted
And no interaction functionality should be lost
And the layout should respond appropriately to the orientation changeScenario: NFR-06-S03 - Health platform data integration
Given I have connected the app to Google Fit
When I complete a workout session
Then the workout data should be correctly exported to Google Fit
And calories, heart rate, and activity duration should be accurately represented
And the data should appear in Google Fit within 5 minutes# Test d'acceptation
Scenario: NFR-06-TA01 - Wearable device integration
Given I have the companion app installed on a supported smartwatch
When I start a workout on my phone
Then workout controls should be available on the smartwatch
And heart rate data should be captured if available
And exercise transitions should be synchronized between devices# Test d'acceptation
Scenario: NFR-06-TA02 - Cross-platform consistency audit
Given we support multiple device types and sizes
When we conduct a consistency audit across platforms
Then all core functionality should work consistently
And visual design should adapt appropriately while maintaining brand identity
And platform-specific features should be properly implementedRequirement: The application must efficiently manage data storage, provide options for data backup/export, and be designed for long-term maintainability.
Acceptance Criteria: - Application storage usage should be optimized and transparent to users - Users must have control over their data with export/backup options - Code architecture must support maintainability and extensibility - Documentation must be comprehensive for future development
Scenario: NFR-07-S01 - Storage space optimization
Given I have been using the app for 6 months with regular workouts
When I check the application's storage usage
Then the total storage should not exceed 100MB excluding media files
And there should be options to manage storage usage
And non-essential data should be eligible for automatic cleanupScenario: NFR-07-S02 - Data backup creation
Given I am logged into the app
When I navigate to settings and choose "Backup Data"
Then the app should create a complete backup of my workout history and settings
And I should be able to select a backup destination
And the backup should be created in an efficient, compressed formatScenario: NFR-07-S03 - Data restoration
Given I have a backup file from a previous device
When I choose to restore from backup
Then all my workout history, programs and settings should be restored
And I should receive a confirmation of successful restoration
And any device-specific settings should be adjusted for the new environment# Test d'acceptation
Scenario: NFR-07-TA01 - Data integrity after app update
Given I have workout history spanning 12 months
When the application is updated to a new version
Then all historical workout data should remain intact and accessible
And no user settings should be reset
And any data schema migrations should be performed transparently# Test d'acceptation
Scenario: NFR-07-TA02 - Code maintainability assessment
Given we have established code quality metrics
When an automated code analysis is performed
Then the codebase should meet or exceed defined thresholds for:
And test coverage (minimum 80% for business logic)
And code complexity (maximum cyclomatic complexity of 15)
And documentation completeness for public APIsRequirement: The application must support multiple languages and adapt to various regional settings to serve a global user base.
Acceptance Criteria: - UI must support right-to-left languages - Date, time, and number formats must adapt to locale settings - All user-facing text must be localizable - Support for metric and imperial measurement systems
Scenario: NFR-08-S01 - Language switching
Given I have set my device language to French
When I install and open the application
Then all UI elements should be displayed in French
And any previously entered user data should maintain integrity
And formatting should adapt to French conventionsScenario: NFR-08-S02 - Measurement unit adaptation
Given I have set my preferences to use imperial units
When I record weight information in a workout
Then the input fields should default to pounds
And previously recorded metric values should convert correctly
And graphs and statistics should display in my preferred unit systemScenario: NFR-08-S03 - Right-to-left language support
Given I have set my device language to Arabic
When I use the application
Then the interface layout should adapt to right-to-left orientation
And navigation patterns should follow right-to-left conventions
And text alignment should be appropriate for Arabic script# Test d'acceptation
Scenario: NFR-08-TA01 - Text expansion accommodation
Given the application supports multiple languages
When UI is rendered in languages with longer text (e.g., German)
Then all text should be fully visible without truncation
And layouts should adjust appropriately to text length
And no UI elements should overlap or extend beyond boundaries# Test d'acceptation
Scenario: NFR-08-TA02 - Cultural appropriateness review
Given we support users from diverse cultural backgrounds
When a cultural review of content is conducted
Then all imagery, examples, and terminology should be culturally sensitive
And regional variations in exercise terminology should be accommodated
And the app should avoid potentially offensive content across culturesRequirement: The application must comply with relevant privacy regulations and give users control over their personal data.
Acceptance Criteria: - Must comply with GDPR, CCPA, and other relevant privacy regulations - Must provide clear privacy policy and terms of service - Must allow users to export and delete their data - Must provide transparency about data collection and usage
Scenario: NFR-09-S01 - Privacy policy accessibility
Given I am a new user of the application
When I complete the onboarding process
Then I should be presented with the privacy policy
And I should have to explicitly accept the terms before using the app
And I should be able to access the privacy policy at any time from settingsScenario: NFR-09-S02 - Data subject access request
Given I am a registered user
When I request to export all my personal data
Then I should receive a complete export in a machine-readable format
And the export should contain all personal data stored about me
And the export should be provided within the legally required timeframeScenario: NFR-09-S03 - Data deletion request
Given I am a registered user
When I request to delete my account and all associated data
Then I should receive confirmation that deletion is in progress
And all my personal data should be removed from active systems
And any data required for legal purposes should be isolated and minimized# Test d'acceptation
Scenario: NFR-09-TA01 - Consent withdrawal process
Given I have previously given consent for optional data collection
When I navigate to privacy settings and withdraw my consent
Then the system should immediately stop collecting the associated data
And I should receive confirmation that my settings have been updated
And previously collected data should be handled according to retention policy# Test d'acceptation
Scenario: NFR-09-TA02 - Privacy regulation compliance audit
Given the application is subject to privacy regulations
When a compliance audit is conducted
Then all required privacy features should be present and functional
And documentation should demonstrate compliance with applicable regulations
And data processing activities should match stated privacy policiesE. Bruno - ?meta:title