FMEDA / Testability Analysis

No Failure Mode left behind

As product designs becomes more complex, the testing complexity increases as well. Therefore, testing electronic systems and mechanical components requires built-in-tests (BIT). Monitoring these tests in an organized and structured manner using Fault Detection and Isolation (FDI) techniques is also required.

FMEDA / Testability Analysis is a standard method for analyzing the coverage and isolation of Built In Test (BIT) circuits. This is vital for ensuring that critical failure-modes are covered and can be quickly identified. Testability Analysis provides insights into the system’s self-diagnostic capabilities.

BQR’s FMEDA / Testability Analysis software can help you to quickly design BITs and ATE (Automatic Test Equipment) for your system, providing high coverage of failure modes, and quick fault isolation.



  • Improve the ability of the product to detect and report failure during operation
  • Improve Maintenance Efficiency
  • Improve product Reliability and Safety during the design phase, and reduce design cycles

Compliance to Standards

BQR’s Testability Analysis software complies with the following standards:

  • Mil-Std-2165
  • Mil-Std-882E
  • Mil-Std-1629A
BIT and test lists

Steps for conducting a Testability Analysis

User Input

  • Use the BQR FMECA project
  • Define list of tests
  • Define which failure modes are covered by each test
  • Define list of BITs
  • For each BIT, assign relevant tests
  • Define Operator and Maintenance messages for each test (optional)



  • The software calculates BIT coverage and isolation for each failure mode severity



  • Coverage and isolation
  • Recommendations for improvement
  • All reports can be customized
  • All reports can be saved as Excel, HTML or Word files
FMEDA / Testability Analysis software screenshot
Fault Isolation Statistics


  • BIT coverage
  • Isolation level
  • False alarms
  • Import and Export bit and test lists
  • Detailed help and wizard for beginners and advanced users