HCRQ, INC. SYSTEM & SOFTWARE SAFETY EXPERTS
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  • Home
  • Markets
    • Aviation
    • Defense
    • Unmanned Systems
    • Rail Transportation
    • Process
    • Automotive
    • Nuclear
    • Medical
  • System/Software Safety Services
    • Consulting >
      • System Safety
      • Software Safety
      • Reliability, Availability, Maintainability
      • Quality Assurance / Quality Control
      • Full List of Consulting Services
    • Training >
      • Courses >
        • System Safety Course
        • Software Safety Course
        • MIL-STD-882E System Safety Course
        • Aviation System Safety Course
        • Hands-On Fault Tree Analysis Course
      • Webinars >
        • System Safety Webinars >
          • System & Software Safety: If You Were Us, What Would You Watch Out For?
          • System Safety Management Plans (SSMPs)
          • System Safety Program Plans (SSPPs)
          • Preliminary Hazard Analysis & Hazard Tracking
          • Operating & Support Hazard Analysis
          • Safety Assessment Report
          • Estimating Probabilities of Human Failures
        • Software Safety Webinars >
          • Software Safety Program Plans (SwSPPs)
          • Software FTA & Software FMEA
        • Other Webinars >
          • How To Get Promoted
        • Webinar FAQs
      • Renowned Attendees
      • Previous Course Attendees
    • Products >
      • Fault Tree Analyses - When to Accept, When to Reject
      • System Safety Program Plan (SSPP) Example
  • Scheduled Courses & Webinars
    • Scheduled Courses
    • Scheduled Webinars
  • Proposal & Technical Writing
    • Proposal Writing
    • Technical Writing
  • About Us
    • Who We Are
    • Hunter Austegard
    • China Austegard
    • Applicable Codes
    • Client List
    • Testimonials - Courseware
    • Testimonials - Consulting
    • Referral Fees
    • Newsletters
    • Reference Material
    • Careers
    • Contact Us
HCRQ, INC. SYSTEM & SOFTWARE SAFETY EXPERTS

COMMON CAUSE ANALYSIS (CCA)


Independence between functions, subsystems or items may be required to satisfy the safety requirements.  It is therefore necessary to ensure that such independence exists, or that the risk associated with dependence is deemed acceptable.

Common Cause Analysis (CCA) provides the means to verify this independence, or to identify specific dependencies.


Common Cause Analysis supports the selection of the system architecture through determination that appropriate independence can be achieved.

The system Fault Tree Analysis (FTA) should be supplemented by the 
Common Cause Analysis to generate the top failure effects of the subsystem FTA.

Similarly, the CCA at the subsystem level should supplement the output of the subsystem FTA to yield the top failure effects at the item level for use in the item FTA.

The item CCA should also supplement the item FTA to further establish the design requirements, development assurance levels, and hardware reliability requirements.

CCA, which is frequently confused with Common Mode Analysis, consists of:


  • Zonal Safety Analysis (ZSA),
  • Particular Risks Analysis (PRA), and
  • Common Mode Analysis (CMA).  By the way, would you like to know how to perform a large portion of Common Mode Analysis easily?  It is just one of many things that you will learn at our system safety courses!
​
​in accordance with SAE ARP4761.

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