Functional requirements of Retail POS System with non-functional

Functional Requirements

1. Sales Transactions
   • Product Scanning: Allow for scanning of barcodes or QR codes to quickly add products to the cart.
   • Manual Entry: Enable manual entry of product codes or descriptions if scanning is not possible.
   • Discounts and Promotions: Apply discounts, coupons, and promotions to transactions as applicable.
   • Sales Tax Calculation: Automatically calculate sales tax based on the product, location, and applicable tax rates.
   • Payment Processing: Handle various payment methods, including cash, credit/debit cards, mobile payments, and gift cards.
   • Receipt Generation: Print or electronically send receipts to customers, including transaction details, payment method, and store information.
2. Inventory Management
   • Stock Tracking: Monitor inventory levels in real-time and update stock quantities based on sales and restocking.
   • Product Information: Maintain detailed product information, including descriptions, prices, and stock levels.
   • Reordering Alerts: Generate alerts or notifications when stock levels fall below predefined thresholds.
   • Supplier Management: Manage supplier information and track orders placed with suppliers.
3. Customer Management
   • Customer Profiles: Create and manage profiles for regular customers, including contact details, purchase history, and loyalty program status.
   • Loyalty Programs: Implement and track customer loyalty programs, including points accumulation and rewards.
   • Customer Feedback: Allow customers to provide feedback or reviews on their shopping experience.
4. Sales Reporting and Analytics
   • Transaction Reports: Generate reports on daily, weekly, or monthly sales, including details of individual transactions.
   • Inventory Reports: Produce reports on inventory levels, stock movements, and turnover rates.
   • Sales Performance: Analyze sales performance by product, department, or employee to identify trends and opportunities.
5. Employee Management
   • User Access Control: Define and manage user roles and permissions, such as cashiers, managers, and administrators.
   • Shift Management: Track employee shifts, hours worked, and generate payroll reports.
   • Performance Tracking: Monitor employee performance metrics, such as sales volume and transaction accuracy.
6. Integration
   • Accounting Systems: Integrate with accounting software to synchronize sales data, expenses, and financial reports.
   • E-commerce Platforms: Sync with online store systems to manage inventory and sales across both physical and digital channels.
   • CRM Systems: Connect with customer relationship management (CRM) systems to leverage customer data and enhance marketing efforts.
7. Refunds and Returns
   • Return Processing: Handle product returns and exchanges, including updating inventory and processing refunds.
   • Refund Management: Manage refunds to customers, including adjustments to payment methods and issuing store credits if necessary.
8. Security and Compliance
   • Data Security: Protect sensitive transaction and customer data through encryption and secure storage.
   • PCI Compliance: Ensure compliance with Payment Card Industry Data Security Standards (PCI DSS) for handling payment card information.

Non-Functional Requirements

1. Performance
   • Response Time: Ensure quick response times for transactions, inventory updates, and report generation (e.g., under 2 seconds for most operations).
   • Scalability: The system should handle increased transaction volumes, multiple registers, and additional locations without performance degradation.
2. Reliability
   • Uptime: Ensure high system availability with minimal downtime (e.g., 99.9% uptime).
   • Error Handling: Implement robust error handling and recovery mechanisms to manage system failures and maintain data integrity.
3. Security
   • Data Protection: Protect sensitive customer and transaction data through encryption, secure access controls, and regular security audits.
   • Authentication and Authorization: Use secure authentication methods and enforce role-based access control to manage user access and permissions.
4. Usability
   • User Interface: Design an intuitive and user-friendly interface for cashiers, managers, and administrators.
   • Training and Support: Provide user-friendly training materials and support resources to ensure staff can efficiently use the system.
5. Maintainability
   • Code Quality: Write high-quality, well-documented code to facilitate system maintenance and updates.
   • Documentation: Provide comprehensive documentation for users and administrators, including manuals, troubleshooting guides, and technical documentation.
6. Availability
   • Backup and Recovery: Implement regular data backups and establish procedures for data recovery in case of system failures or data loss.
   • Failover: Ensure the system has failover capabilities to switch to backup systems or servers if necessary.
7. Portability
   • Cross-Platform Compatibility: Ensure the system is compatible with various hardware and operating systems used in retail environments, including POS terminals, tablets, and mobile devices.
8. Supportability
   • Technical Support: Provide mechanisms for users to obtain support and resolve issues, including help desks, online resources, and customer service.
   • Error Reporting: Include functionality for users to report issues or bugs and track their resolution.