Critical Systems Safety & Risk Analysis

We rely on the safety of many critical systems around us, including medical devices, public transportation and private vehicles, aviation, power grids, consumer electronics, autonomous vehicles and robots, and defense systems.

As our world becomes more technologically advanced, achieving high safety standards during system or product design becomes more challenging.


Guidelines for risk and safety analysis of various industries were defined in standards


Topic by segment Standard
Generic functional safety of Electrical/Electronic/Programmable Electronic Safety-related Systems IEC 61508
Functional safety for RAIL EN 50126-50129
Functional safety for Automotive ISO 26262
Functional safety for Process industry IEC 61511
Functional safety for Nuclear industry IEC 61513
Guidelines For Development Of Civil Aircraft and Systems ARP 4754A
Application of risk management to medical devices ISO 14971

Standard process for Safety and Reliability Analyses

Systems Risk analysis

In some cases, additional analysis methods are required such as Markov Chain and RBD Network analyses.


BQR offers an integrated software solution and consulting services for safety analyses including

  • FMEA / FMECA (Failure Modes, Effects, and Criticality Analysis) flexible module supporting all major safety standards: (Mil-Std-1629A, Mil-Std-882E, EN 50126, ISO 31000, IEC 61508 and more).
  • FTA (Fault Tree Analysis) for calculating the occurrence probability of safety events.
    Complies with IEC 61025.
  • Reliability Block Diagram including Safety Integrity Level (SIL) analysis, RBD Networks and Markov chain models. Complies with IEC 61078 and IEC 61508.
  • Testability Analysis for design of Built In Tests (BITs) with high failure mode coverage and Isolation. Complies with MIL-STD 2165.
  • Statistical analysis of failure and maintenance field data. Complies with MIL-HDBK 338.
  • MTTR (Mean Time To Repair / Replace)  for maintaining critical system. Complies with MIL-HDBK 472.
Risk analysis matrix
Risk analysis Matrix
FTA traditional view
FTA traditional view