10. Quality Requirements (MVP)¶

10.1 MVP Quality Goals¶

Quality goals are defined in Section 1.2. This section details how they are measured and implemented.

MVP Quality Priorities¶

10.2 MVP Performance Requirements¶

Note: Performance targets will be measured during MVP implementation. See Section 7.8 for monitoring approach.

MVP Performance Goals¶

graph TB
    subgraph "MVP Performance Goals"
        subgraph "Execution Time"
            Config[Load configuration<br/>To be measured]
            Setup[Configure workshop<br/>To be measured]
            Sim[Simulation execution<br/>To be measured]
            Output[Generate output<br/>To be measured]
        end

        subgraph "Resource Usage"
            Memory[Memory usage<br/>To be measured]
            CPU[CPU utilization<br/>Single-threaded]
            Disk[Disk space<br/>Estimated: ~100 MB + results]
        end

        subgraph "Scalability"
            Small[100 wagons<br/>To be measured]
            Medium[1000 wagons<br/>To be measured]
            Large[5000 wagons<br/>To be measured]
        end
    end

    classDef time fill:#e3f2fd
    classDef resource fill:#e8f5e8
    classDef scale fill:#fff3e0

    class Config,Setup,Sim,Output time
    class Memory,CPU,Disk resource
    class Small,Medium,Large scale

MVP Performance Measurements¶

10.3 MVP Usability Requirements¶

MVP Usability Goals¶

graph TB
    subgraph "MVP Usability Goals"
        subgraph "Ease of Use"
            Install[Simple installation<br/>uv sync]
            Config[Simple configuration<br/>JSON/CSV files]
            Run[Simple execution<br/>uv run python main.py]
        end

        subgraph "Error Handling"
            Clear[Clear error messages<br/>Actionable feedback]
            Recovery[Graceful degradation<br/>Partial results on error]
            Help[Built-in help<br/>--help parameter]
        end

        subgraph "Output Quality"
            Readable[Readable output<br/>CSV format]
            Visual[Visualization<br/>Matplotlib PNG]
            Logs[Detailed logs<br/>Debugging information]
        end
    end

    classDef ease fill:#4caf50,stroke:#2e7d32
    classDef error fill:#ff9800,stroke:#e65100
    classDef output fill:#2196f3,stroke:#1565c0

    class Install,Config,Run ease
    class Clear,Recovery,Help error
    class Readable,Visual,Logs output

MVP Usability Criteria¶

10.4 MVP Reliability Requirements¶

MVP Reliability Goals¶

graph TB
    subgraph "MVP Reliability"
        subgraph "Error Tolerance"
            InputErrors[Input validation<br/>Catch invalid data]
            RuntimeErrors[Runtime stability<br/>No crashes during simulation]
            OutputErrors[Output robustness<br/>Partial results on error]
        end

        subgraph "Determinism"
            Reproducible[Reproducible results<br/>Same input → same output]
            Seeded[Seeded random<br/>Controlled randomness]
            Consistent[Consistent behavior<br/>Cross-platform]
        end

        subgraph "Recovery"
            Logging[Comprehensive logging<br/>Debug information]
            Cleanup[Resource cleanup<br/>No memory leaks]
            Restart[Easy restart<br/>No persistent state issues]
        end
    end

    classDef tolerance fill:#e3f2fd
    classDef determinism fill:#e8f5e8
    classDef recovery fill:#fff3e0

    class InputErrors,RuntimeErrors,OutputErrors tolerance
    class Reproducible,Seeded,Consistent determinism
    class Logging,Cleanup,Restart recovery

MVP Reliability Metrics¶

10.5 MVP Maintainability Requirements¶

MVP Code Quality Standards¶

# MVP Code Quality Standards
class CodeQualityMetrics:
    MAX_FUNCTION_LENGTH = 50      # Lines per function
    MAX_CLASS_LENGTH = 200        # Lines per class
    MAX_COMPLEXITY = 10           # Cyclomatic complexity
    MIN_TEST_COVERAGE = 90        # Percent
    MAX_DEPENDENCIES = 5          # Per module

MVP Maintainability Metrics¶

10.6 MVP Portability Requirements¶

MVP Platform Support¶

graph TB
    subgraph "MVP Platform Support"
        subgraph "Operating Systems"
            Windows[Windows 10+<br/>Primary target]
            MacOS[macOS 10.15+<br/>Primary target]
            Linux[Ubuntu 20.04+<br/>Primary target]
        end

        subgraph "Python Versions"
            Python313[Python 3.13+<br/>Required]
        end

        subgraph "Hardware"
            Laptop[Standard laptop<br/>Estimated: 4GB RAM minimum]
            Desktop[Desktop PC<br/>Estimated: 4GB RAM minimum]
        end
    end

    classDef primary fill:#4caf50,stroke:#2e7d32
    classDef secondary fill:#ff9800,stroke:#e65100
    classDef hardware fill:#2196f3,stroke:#1565c0

    class Windows,MacOS,Linux,Python313 primary
    class Laptop,Desktop hardware

MVP Portability Tests¶

10.7 MVP Security Requirements¶

MVP Security Goals¶

graph TB
    subgraph "MVP Security"
        subgraph "Input Security"
            Validation[Input validation<br/>Pydantic models]
            Sanitization[Path sanitization<br/>No directory traversal]
            Limits[Resource limits<br/>File size, memory]
        end

        subgraph "Data Security"
            NoCredentials[No credentials<br/>No sensitive data stored]
            LocalOnly[Local processing<br/>No network communication]
            TempFiles[Safe temp files<br/>Proper cleanup]
        end

        subgraph "Error Security"
            NoLeakage[No information leakage<br/>Safe error messages]
            Logging[Safe logging<br/>No sensitive data in logs]
        end
    end

    classDef input fill:#e3f2fd
    classDef data fill:#e8f5e8
    classDef error fill:#fff3e0

    class Validation,Sanitization,Limits input
    class NoCredentials,LocalOnly,TempFiles data
    class NoLeakage,Logging error

MVP Security Measures¶

10.8 MVP Testability Requirements¶

MVP Test Strategy¶

graph TB
    subgraph "MVP Testing Strategy"
        subgraph "Unit Tests"
            Models[Domain Models<br/>Business Logic]
            Services[Service classes<br/>Isolated testing]
            Utils[Utility functions<br/>Pure functions]
        end

        subgraph "Integration Tests"
            FileIO[File I/O<br/>JSON/CSV processing]
            SimPy[SimPy integration<br/>Simulation engine]
            EndToEnd[End-to-end<br/>Complete scenarios]
        end

        subgraph "Manual Tests"
            Scenarios[Test scenarios<br/>Real configurations]
            Performance[Performance tests<br/>Large datasets]
            Platforms[Platform tests<br/>Cross-platform]
        end
    end

    classDef unit fill:#4caf50,stroke:#2e7d32
    classDef integration fill:#ff9800,stroke:#e65100
    classDef manual fill:#9e9e9e,stroke:#616161

    class Models,Services,Utils unit
    class FileIO,SimPy,EndToEnd integration
    class Scenarios,Performance,Platforms manual

MVP Test Metrics¶