TTX Vault Package #7 - National Planning Scenarios-Functional LevelThe fifteen all hazards National Planning Scenarios are an integral component of DHSs capabilities based approach to implementing Homeland Security Presidential Directive 8: National Preparedness (HSPD 8). The scenarios serve as the foundation for the development of homeland security tasks, target capabilities, and standards and performance metrics against which capabilities and tasks will ultimately be measured. NPS 4 Biological Attack, NPS 8