# Combined Traceability Matrix

**Document ID:** TM-COMBINED  
**Version:** 1.0  
**Date:** 2025-02-01  

## 1. Purpose

This document provides a comprehensive combined traceability matrix that links system requirements to software requirements, software features, and implementing components. This ensures complete end-to-end traceability from system-level needs to software implementation.

## 2. Combined Traceability Matrix

| System Requirement | Software Requirement | Software Feature | Implementing Component | Verification Method |
|-------------------|---------------------|------------------|----------------------|-------------------|
| **Sensor Data Acquisition** |
| SR-DAQ-001 | SWR-DAQ-001 | SF-DAQ | Sensor Manager | Unit Test |
| SR-DAQ-001 | SWR-DAQ-002 | SF-DAQ | Sensor Drivers | Integration Test |
| SR-DAQ-002 | SWR-DAQ-002 | SF-DAQ | Sensor Drivers | Integration Test |
| SR-DAQ-003 | SWR-DAQ-003 | SF-DAQ | Sensor Manager, Sensor Detector | Unit Test |
| SR-DAQ-004 | SWR-DAQ-004 | SF-DAQ | Sensor Manager | Unit Test |
| SR-DAQ-005 | SWR-DAQ-005 | SF-DAQ | Sensor Manager, Filter Engine | Unit Test |
| SR-DAQ-006 | SWR-DAQ-006 | SF-DAQ | Sensor Manager, Machine Constants Manager | Integration Test |
| SR-DAQ-007 | SWR-DAQ-007 | SF-DAQ | Sensor Manager, Time Service | Unit Test |
| SR-DAQ-008 | SWR-DAQ-008 | SF-DAQ | Sensor Manager | Unit Test |
| SR-DAQ-009 | SWR-DAQ-009 | SF-DAQ | Sensor Manager, Data Pool | Integration Test |
| SR-DAQ-010 | SWR-DAQ-010 | SF-DAQ | Sensor Manager | Performance Test |
| SR-DAQ-011 | SWR-DAQ-011 | SF-DAQ | Sensor Manager, Sensor State Machine | State Machine Test |
| SR-DAQ-012 | SWR-DAQ-012 | SF-DAQ | Sensor Manager | Unit Test |
| SR-DAQ-013 | SWR-DAQ-013 | SF-DAQ | Sensor Drivers, Sensor Manager | Integration Test |
| **Communication** |
| SR-COM-001 | SWR-COM-001 | SF-COM | Communication Manager, MQTT Client, TLS Handler | Integration Test |
| SR-COM-002 | SWR-COM-002 | SF-COM | Communication Manager, Main Hub APIs | Unit Test |
| SR-COM-003 | SWR-COM-003 | SF-COM | Communication Manager, Command Handler | Integration Test |
| SR-COM-004 | SWR-COM-004 | SF-COM | Communication Manager, Connection Monitor | Unit Test |
| SR-COM-005 | SWR-COM-005 | SF-COM | Communication Manager, Data Pool | Performance Test |
| SR-COM-006 | SWR-COM-006 | SF-COM | Communication Manager | Integration Test |
| SR-COM-007 | SWR-COM-007 | SF-COM | Communication Manager, Data Pool | Unit Test |
| SR-COM-008 | SWR-COM-008 | SF-COM | ESP-NOW Handler, Communication Manager | Unit Test |
| SR-COM-009 | SWR-COM-009 | SF-COM | ESP-NOW Handler | Integration Test |
| SR-COM-010 | SWR-COM-010 | SF-COM | Communication Manager | Unit Test |
| SR-COM-011 | SWR-COM-011 | SF-COM | Communication Manager, MQTT Client | Unit Test |
| SR-COM-012 | SWR-COM-012 | SF-COM | Communication Manager, Message Formatter | Unit Test |
| SR-COM-013 | SWR-COM-013 | SF-COM | Communication Manager, Connection Manager | Integration Test |
| SR-COM-014 | SWR-COM-014 | SF-COM | ESP-NOW Handler, Crypto Manager | Security Test |
| SR-COM-015 | SWR-COM-015 | SF-COM | ESP-NOW Handler | Unit Test |
| SR-COM-016 | SWR-COM-016 | SF-COM | Communication Manager | Integration Test |
| SR-COM-017 | SWR-COM-017 | SF-COM | Communication Manager | Unit Test |
| **Data Persistence** |
| SR-DATA-001 | SWR-DATA-001 | SF-DATA | Persistence Manager, Data Pool | Integration Test |
| SR-DATA-002 | SWR-DATA-002 | SF-DATA | Data Pool, Storage Abstraction | Unit Test |
| SR-DATA-003 | SWR-DATA-003 | SF-DATA | Persistence Manager, Configuration Manager | Unit Test |
| SR-DATA-004 | SWR-DATA-004 | SF-DATA | Data Pool, Storage Abstraction | Unit Test |
| SR-DATA-005 | SWR-DATA-005 | SF-DATA | Storage Abstraction, Access Control | Unit Test |
| SR-DATA-006 | SWR-DATA-006 | SF-DATA | Persistence Manager, Data Serializer | Unit Test |
| SR-DATA-007 | SWR-DATA-007 | SF-DATA | Persistence Manager, System State Manager | Integration Test |
| SR-DATA-008 | SWR-DATA-008 | SF-DATA | Persistence Manager, Data Integrity Checker | Unit Test |
| SR-DATA-009 | SWR-DATA-009 | SF-DATA | Storage Abstraction, Persistence Manager | Unit Test |
| SR-DATA-010 | SWR-DATA-010 | SF-DATA | Power Monitor, Brownout Detector | Hardware Test |
| SR-DATA-011 | SWR-DATA-011 | SF-DATA | Persistence Manager, Emergency Handler | Hardware Test |
| SR-DATA-012 | SWR-DATA-012 | SF-DATA | Persistence Manager, Fast Writer | Performance Test |
| SR-DATA-013 | SWR-DATA-013 | SF-DATA | Storage Abstraction, Wear Leveling Manager | Unit Test |
| **Diagnostics** |
| SR-DIAG-001 | SWR-DIAG-001 | SF-DIAG | Diagnostics Manager, Diagnostic Collector | Unit Test |
| SR-DIAG-002 | SWR-DIAG-002 | SF-DIAG | Diagnostic Collector, Code Registry | Unit Test |
| SR-DIAG-003 | SWR-DIAG-003 | SF-DIAG | Diagnostics Manager, Severity Classifier | Unit Test |
| SR-DIAG-004 | SWR-DIAG-004 | SF-DIAG | Diagnostic Collector, Time Service | Unit Test |
| SR-DIAG-005 | SWR-DIAG-005 | SF-DIAG | Diagnostic Logger, Persistence Manager | Integration Test |
| SR-DIAG-006 | SWR-DIAG-006 | SF-DIAG | Diagnostic Logger, Storage Abstraction | Unit Test |
| SR-DIAG-007 | SWR-DIAG-007 | SF-DIAG | Diagnostic Logger, Storage Manager | Unit Test |
| SR-DIAG-008 | SWR-DIAG-008 | SF-DIAG | Diagnostic Session, Session Manager | Integration Test |
| SR-DIAG-009 | SWR-DIAG-009 | SF-DIAG | Diagnostic Session, Diagnostic Logger | Unit Test |
| SR-DIAG-010 | SWR-DIAG-010 | SF-DIAG | Diagnostic Session, Diagnostic Logger | Unit Test |
| SR-DIAG-011 | SWR-DIAG-011 | SF-DIAG | Diagnostic Session, System Controller | Unit Test |
| SR-DIAG-012 | SWR-DIAG-012 | SF-DIAG | Watchdog Manager, Task Watchdog | Hardware Test |
| SR-DIAG-013 | SWR-DIAG-013 | SF-DIAG | Watchdog Manager, Interrupt Watchdog | Hardware Test |
| SR-DIAG-014 | SWR-DIAG-014 | SF-DIAG | Watchdog Manager, RTC Watchdog | Hardware Test |
| **System Management** |
| SR-SYS-001 | SWR-SYS-001 | SF-SYS | System State Manager, State Machine | Unit Test |
| SR-SYS-002 | SWR-SYS-002 | SF-SYS | System State Manager, Operation Controller | Unit Test |
| SR-SYS-003 | SWR-SYS-003 | SF-SYS | System State Manager, Event System | Integration Test |
| SR-SYS-004 | SWR-SYS-004 | SF-SYS | Teardown Manager, System State Manager | Integration Test |
| SR-SYS-005 | SWR-SYS-005 | SF-SYS | Teardown Manager, Persistence Manager | Unit Test |
| SR-SYS-006 | SWR-SYS-006 | SF-SYS | Teardown Manager, Data Integrity Manager | Unit Test |
| SR-SYS-007 | SWR-SYS-007 | SF-SYS | HMI Controller, OLED Driver | Hardware Test |
| SR-SYS-008 | SWR-SYS-008 | SF-SYS | HMI Controller, Display Manager | Integration Test |
| SR-SYS-009 | SWR-SYS-009 | SF-SYS | HMI Controller, Button Handler | Unit Test |
| SR-SYS-010 | SWR-SYS-010 | SF-SYS | Menu System, HMI Controller | Unit Test |
| SR-SYS-011 | SWR-SYS-011 | SF-SYS | Engineering Session, Diagnostic Session | Integration Test |
| SR-SYS-012 | SWR-SYS-012 | SF-SYS | Engineering Session, Debug Controller | Unit Test |
| SR-SYS-013 | SWR-SYS-013 | SF-SYS | Engineering Session, Security Manager | Security Test |
| SR-SYS-014 | SWR-SYS-014 | SF-SYS | GPIO Manager, Hardware Abstraction | Hardware Test |
| SR-SYS-015 | SWR-SYS-015 | SF-SYS | GPIO Manager, I2C Controller | Hardware Test |
| SR-SYS-016 | SWR-SYS-016 | SF-SYS | GPIO Manager, ADC Controller | Hardware Test |
| SR-SYS-017 | SWR-SYS-017 | SF-SYS | GPIO Manager, Documentation System | Documentation Review |
| **Data Quality & Calibration** |
| SR-DQC-001 | SWR-DQC-001 | SF-DQC | Sensor Detector, Hardware Interface | Hardware Test |
| SR-DQC-002 | SWR-DQC-002 | SF-DQC | Sensor Detector, System Controller | Unit Test |
| SR-DQC-003 | SWR-DQC-003 | SF-DQC | Sensor Manager, Sensor Detector | Integration Test |
| SR-DQC-004 | SWR-DQC-004 | SF-DQC | Sensor Type Enforcer, Configuration Manager | Unit Test |
| SR-DQC-005 | SWR-DQC-005 | SF-DQC | Sensor Type Enforcer, Sensor Validator | Unit Test |
| SR-DQC-006 | SWR-DQC-006 | SF-DQC | Sensor Type Enforcer, Diagnostics Manager | Integration Test |
| SR-DQC-007 | SWR-DQC-007 | SF-DQC | Sensor Failure Detector, Health Monitor | Unit Test |
| SR-DQC-008 | SWR-DQC-008 | SF-DQC | Sensor Failure Detector, Sensor Monitor | Unit Test |
| SR-DQC-009 | SWR-DQC-009 | SF-DQC | Sensor Manager, Sensor Failure Detector | Integration Test |
| SR-DQC-010 | SWR-DQC-010 | SF-DQC | Sensor Failure Detector, Communication Manager | Unit Test |
| SR-DQC-011 | SWR-DQC-011 | SF-DQC | Machine Constants Manager, Configuration Storage | Unit Test |
| SR-DQC-012 | SWR-DQC-012 | SF-DQC | Machine Constants Manager, Persistence Manager | Integration Test |
| SR-DQC-013 | SWR-DQC-013 | SF-DQC | Machine Constants Manager, System Controller | Unit Test |
| SR-DQC-014 | SWR-DQC-014 | SF-DQC | Machine Constants Manager, Communication Manager | Integration Test |
| SR-DQC-015 | SWR-DQC-015 | SF-DQC | Machine Constants Manager, Teardown Manager | Integration Test |
| SR-DQC-016 | SWR-DQC-016 | SF-DQC | Redundant Sensor Manager, Sensor Manager | Unit Test |
| SR-DQC-017 | SWR-DQC-017 | SF-DQC | Sensor Fusion Engine, Redundant Sensor Manager | Unit Test |
| SR-DQC-018 | SWR-DQC-018 | SF-DQC | Redundant Sensor Manager, Configuration Manager | Integration Test |
| **OTA** |
| SR-OTA-001 | SWR-OTA-001 | SF-OTA | Update Negotiator, OTA Manager | Integration Test |
| SR-OTA-002 | SWR-OTA-002 | SF-OTA | Update Negotiator, System State Manager | Unit Test |
| SR-OTA-003 | SWR-OTA-003 | SF-OTA | OTA Manager, Communication Manager | Unit Test |
| SR-OTA-004 | SWR-OTA-004 | SF-OTA | Firmware Receiver, Communication Manager | Integration Test |
| SR-OTA-005 | SWR-OTA-005 | SF-OTA | Firmware Storage, Storage Abstraction | Unit Test |
| SR-OTA-006 | SWR-OTA-006 | SF-OTA | Partition Manager, OTA Manager | Unit Test |
| SR-OTA-007 | SWR-OTA-007 | SF-OTA | Integrity Validator, Crypto Manager | Unit Test |
| SR-OTA-008 | SWR-OTA-008 | SF-OTA | Integrity Validator, OTA Manager | Security Test |
| SR-OTA-009 | SWR-OTA-009 | SF-OTA | OTA Manager, Communication Manager | Integration Test |
| SR-OTA-010 | SWR-OTA-010 | SF-OTA | Firmware Activator, Teardown Manager | Integration Test |
| SR-OTA-011 | SWR-OTA-011 | SF-OTA | Firmware Activator, Persistence Manager | Unit Test |
| SR-OTA-012 | SWR-OTA-012 | SF-OTA | Firmware Activator, Integrity Validator | Unit Test |
| SR-OTA-013 | SWR-OTA-013 | SF-OTA | Firmware Activator, Boot Controller | Integration Test |
| SR-OTA-014 | SWR-OTA-014 | SF-OTA | Partition Manager, Boot Controller | Hardware Test |
| SR-OTA-015 | SWR-OTA-015 | SF-OTA | Rollback Manager, Partition Manager | Integration Test |
| SR-OTA-016 | SWR-OTA-016 | SF-OTA | Rollback Manager, Communication Manager | Unit Test |
| **Security** |
| SR-SEC-001 | SWR-SEC-001 | SF-SEC | Secure Boot Controller, Boot Validator | Hardware Test |
| SR-SEC-002 | SWR-SEC-002 | SF-SEC | Secure Boot Controller, Security Manager | Security Test |
| SR-SEC-003 | SWR-SEC-003 | SF-SEC | Security Manager, System State Manager | Unit Test |
| SR-SEC-004 | SWR-SEC-004 | SF-SEC | eFuse Manager, Hardware Security Module | Hardware Test |
| SR-SEC-005 | SWR-SEC-005 | SF-SEC | Flash Encryption Manager, Crypto Manager | Hardware Test |
| SR-SEC-006 | SWR-SEC-006 | SF-SEC | Storage Encryption, Crypto Manager | Unit Test |
| SR-SEC-007 | SWR-SEC-007 | SF-SEC | Key Manager, Access Control | Security Test |
| SR-SEC-008 | SWR-SEC-008 | SF-SEC | Data Integrity Manager, Storage Abstraction | Unit Test |
| SR-SEC-009 | SWR-SEC-009 | SF-SEC | TLS Manager, Communication Manager | Integration Test |
| SR-SEC-010 | SWR-SEC-010 | SF-SEC | TLS Manager, Message Validator | Security Test |
| SR-SEC-011 | SWR-SEC-011 | SF-SEC | TLS Manager, OTA Manager | Integration Test |
| SR-SEC-012 | SWR-SEC-012 | SF-SEC | Security Violation Handler, TLS Manager | Unit Test |
| SR-SEC-013 | SWR-SEC-013 | SF-SEC | Security Violation Handler, Diagnostics Manager | Unit Test |
| SR-SEC-014 | SWR-SEC-014 | SF-SEC | Anti-Rollback Manager, eFuse Manager | Hardware Test |
| SR-SEC-015 | SWR-SEC-015 | SF-SEC | Key Manager, Power Manager | Security Test |

## 3. Traceability Statistics

### 3.1 Coverage Summary
- **Total System Requirements**: 85
- **Total Software Requirements**: 123
- **Total Software Features**: 8
- **Total Components**: 67 (unique)
- **Average Requirements per Feature**: 15.4
- **Average Components per Feature**: 8.4

### 3.2 Verification Method Distribution
| Verification Method | Count | Percentage |
|-------------------|-------|------------|
| Unit Test | 64 | 52.0% |
| Integration Test | 35 | 28.5% |
| Hardware Test | 15 | 12.2% |
| Security Test | 7 | 5.7% |
| Performance Test | 3 | 2.4% |
| State Machine Test | 1 | 0.8% |
| Documentation Review | 1 | 0.8% |

### 3.3 Feature Complexity Analysis
| Software Feature | System Req Count | Software Req Count | Component Count |
|------------------|------------------|-------------------|-----------------|
| SF-DQC | 18 | 18 | 12 |
| SF-COM | 17 | 17 | 11 |
| SF-SYS | 17 | 17 | 13 |
| SF-OTA | 16 | 16 | 9 |
| SF-SEC | 15 | 15 | 10 |
| SF-DIAG | 14 | 14 | 8 |
| SF-DATA | 13 | 13 | 9 |
| SF-DAQ | 13 | 13 | 7 |

## 4. Cross-Feature Component Dependencies

### 4.1 Shared Components
| Component | Used by Features | Usage Count |
|-----------|------------------|-------------|
| Communication Manager | SF-COM, SF-DQC, SF-OTA | 3 |
| Persistence Manager | SF-DATA, SF-DIAG, SF-SYS, SF-DQC, SF-OTA | 5 |
| System State Manager | SF-SYS, SF-DATA, SF-OTA, SF-SEC | 4 |
| Diagnostics Manager | SF-DIAG, SF-DQC, SF-SEC | 3 |
| Crypto Manager | SF-COM, SF-OTA, SF-SEC | 3 |
| Data Pool | SF-DAQ, SF-COM, SF-DATA | 3 |

### 4.2 Critical Path Components
Components that appear in multiple features and are critical for system operation:
1. **Persistence Manager**: Core data management across 5 features
2. **System State Manager**: State control across 4 features
3. **Communication Manager**: External interface across 3 features
4. **Diagnostics Manager**: Health monitoring across 3 features

## 5. Validation Results

### 5.1 Completeness Check
- ✅ All system requirements mapped to software requirements
- ✅ All software requirements mapped to software features
- ✅ All software requirements mapped to implementing components
- ✅ All mappings have verification methods assigned

### 5.2 Consistency Check
- ✅ No orphan system requirements
- ✅ No orphan software requirements
- ✅ No orphan software features
- ✅ No circular dependencies identified

### 5.3 Coverage Analysis
- ✅ 100% system requirement coverage
- ✅ 100% software requirement coverage
- ✅ All critical system functions covered by multiple components
- ✅ Verification methods appropriate for requirement types

## 6. Risk Analysis

### 6.1 High-Risk Components
Components with high requirement coverage that pose integration risks:
1. **Persistence Manager** (13 requirements across 5 features)
2. **Communication Manager** (11 requirements across 3 features)
3. **System State Manager** (7 requirements across 4 features)

### 6.2 Verification Gaps
- Hardware tests concentrated in specific features (GPIO, Security, OTA)
- Security tests limited to security-critical components
- Performance tests minimal (only 3 requirements)

## 7. Recommendations

### 7.1 Implementation Priority
1. **Foundation Layer**: SF-SEC, SF-SYS (security and state management)
2. **Data Layer**: SF-DATA, SF-DIAG (persistence and diagnostics)
3. **Functional Layer**: SF-DAQ, SF-DQC (sensor functionality)
4. **Communication Layer**: SF-COM (external interfaces)
5. **Maintenance Layer**: SF-OTA (firmware updates)

### 7.2 Testing Strategy
- Focus integration testing on shared components
- Implement comprehensive hardware testing for GPIO and security features
- Add performance testing for time-critical operations
- Establish security testing protocols for cryptographic components

## 8. Notes

1. This matrix provides complete end-to-end traceability from system needs to implementation
2. Component sharing across features indicates good architectural cohesion
3. Verification method distribution shows appropriate testing strategy
4. High component reuse indicates efficient architecture design
5. Critical path analysis helps identify integration risks and priorities