2.5.6.2.3. Human Systems Integration (HSI) considerations that have a major impact on system effectiveness, suitability, and survivability. The HSI Force Protection and Survivability domain contributes to the Force Protection KPP by defining requirements for personnel force protection and personnel survivability. The HSI Safety and Occupational Health domain contributes to the Force Protection KPP by defining requirements for personnel and system safety. DOTmLPF-P analyses should identify and address HSI.