Dr. Homayoon Dezfuli

System Safety Technical Fellow

Learn more about System Safety Technical Fellow Dr. Homayoon Dezfuli.

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Diane Koons

System Safety Technical Discipline Team Lead

Learn more about System Safety Technical Discipline Team Lead Diane Koons.

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Points of Contact

Points of Contact

For details on contacting a System Safety Point of Contact (PoC) for your location, click below.

Find Your PoC

System Safety Steering Group

"The NASA System Safety Steering Group (S3G) develops Agency-wide plans and strategies to improve the:

  1. Content of the system safety discipline and competency of the System Safety workforce, especially with regard to quantitative risk modeling and analysis, systems engineering, and risk management (including risk-informed decision making).
  2. Integration of system safety with related disciplines; including, but not limited to reliability, availability, and maintainability; risk management; risk assessment; systems engineering; cost and schedule analysis; and program/project management.
  3. Implementation of the system safety requirements of NPR 8000.4A, NPR 8715.3C, and NPR 8705.2B.
  4. Inclusion of system safety personnel early in project development and systems engineering."

System Safety Program Steering Group Charter

System Safety Technical Discipline Team

“The TDT is a technical resource that will support the Office of Safety and Mission Assurance (OSMA), NASA Safety Center (NSC), and NASA Centers in matters pertaining to SS engineering and related functions.”

Technical Discipline Team Charter


Launch SATERN  My STEP  Webinars 

SATERN Courses

Course Title Course Number Buttons
Accident Precursor Analysis I SMA-SS-WBT-0007 SMA-SS-WBT-0007 Details
Accident Precursor Analysis II SMA-SS-WBT-0014 SMA-SS-WBT-0014 Details
Application of Bayesian Probability Inference to Probabilistic Risk Assessment of Space Systems SMA-SS-WBT-0004 SMA-SS-WBT-0004 Details
Basic Fault Tree Analysis I SMA-SS-WBT-0009 SMA-SS-WBT-0009 Details
Basic Fault Tree Analysis II SMA-SS-WBT-0010 SMA-SS-WBT-0010 Details
Hazard Analysis Basics SMA-SS-WBT-200 SMA-SS-WBT-200 Details
Hazards Analysis for Practitioners SMA-SS-WBT-213 SMA-SS-WBT-213 Details
Hazard Report Evaluation Basics SMA-SS-WBT-901 SMA-SS-WBT-901 Details
Modeling and Simulation in Probabilistic Safety Analysis SMA-SS-WBT-0015 SMA-SS-WBT-0015 Details
P: Basics of System Safety SMA-SS-WBT-100 SMA-SS-WBT-100 Details
Probabilistic Risk Assessment Methods (PRAM) for Practitioners and Managers SMA-SS-WBT-0001 SMA-SS-WBT-0001 Details
Probability & Statistics I SMA-SS-WBT-0005 SMA-SS-WBT-0005 Details
Probability & Statistics II SMA-SS-WBT-0006 SMA-SS-WBT-0006 Details
Risk Informed Decision Making (RIDM) SMA-SS-WBT-0013 SMA-SS-WBT-0013 Details
Safety & Mission Assurance in the Acquisition Process SMA-SS-WBT-0023 SMA-SS-WBT-0023 Details
System Safety Analysis Relationships with Single Point of Failure Analysis SMA-SS-WBT-400 SMA-SS-WBT-400 Details
System Safety Engineering SMA-SS-WBT-440 SMA-SS-WBT-440 Details
System Safety I SMA-SS-WBT-210 SMA-SS-WBT-210 Details
System Safety II SMA-SS-WBT-0012 SMA-SS-WBT-0012 Details
System Safety Fundamentals SMA-SS-WBT-0002 SMA-SS-WBT-0002 Details
System Safety for Practitioners SMA-SS-WBT-211 SMA-SS-WBT-211 Details
Workshop in SAPHIRE Code and Probabilistic Risk Assessment for Space Systems SMA-SS-WBT-0003 SMA-SS-WBT-0003 Details

Policy and Guidance


Policy Title Buttons Buttons
NPD 8700.1 NASA Policy for Safety and Mission Success NPD-8700-1 Details See NPD 8700.1
NPR 8000.4 Risk Management Procedural Requirements NPR-8000-4 Details See NPR 8000.4
NPR 8705.2 Human Rating Requirements for Space Systems NPR-8705-2 Details See NPR 8705.2
NPR 8715.3, Chapter 2
NASA General Safety Program Requirements, System Safety NPR-8715-3 Details See NPR 8715.3
NASA/SP-2010-580 NASA System Safety Handbook, Volume 1: System Safety Framework and Concepts for Implementation NASASP-2010-580 Details See NASA/SP-2010-580
NASA/SP-2014-612 NASA System Safety Handbook, Volume 2: System Safety Concepts, Guidelines, and Implementation Examples NASASP-2014-612 Details See NASA/SP-2014-612
NASA/SP-2011-3422 NASA Risk Management Handbook NASASP-2011-3422 Details See NASA/SP-2011-3422
NASA/SP-2011-3421 Probabilistic Risk Assessment Procedures Guide for NASA Managers and Practitioners NASASP-2011-3421 Details See NASA/SP-2011-3421

Recommended Reading

Learn more about System Safety and related disciplines by reading these documents and those listed in the Policy and Guidance section.

The Role of NASA Safety Thresholds and Goals in Achieving Adequate Safety


NASA has recently instituted requirements for establishing agency-level safety thresholds and goals that define long-term targeted and maximum tolerable levels of risk to the crew as guidance to developers in evaluating “how safe is safe enough” for a given type of mission. This paper discusses some key concepts regarding the role of the Agency’s safety thresholds and goals in achieving adequate safety, where adequate safety entails not only meeting a minimum tolerable level of safety (e.g., as determined from safety thresholds and goals), but being as safe as reasonably practicable, regardless of how safe the system is in absolute terms.

See Paper 

A Vision for System Safety


System Safety is the application of scientific, engineering, and management principles, criteria and techniques to optimize safety within the constraints of operational effectiveness, time and cost throughout all phases of the system life cycle. System Safety takes an integrated, system-level perspective towards safety, recognizing that safety is an emergent property that is defined only in the context of the whole system operating within a specified performance envelope. System Safety is an integral part of Systems Engineering and Risk Management that informs all decisions having the potential to affect safety.

See Paper