The Information Source for Systems Testability and Diagnostics

History of Testability
An Interactive Guide to Important Events in Testability



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Testability Origin and Maturation

As related to Model-Based Diagnostics

Innovations and Milestones


Innovation Milestone  
1965 * Logic Model Diagnostic Concept
* Ralph De Paul develops first ever Diagnostic Dependcy Model and Functional Modeling
1966   * MIL-M-24100 Maintenance Standard
  *   Maintenance Dependency Charts (MDC) introduced
  *   Design Disclosure Format (DDF) introduced
1967 *   “FIST” – ability (Fault Isolation through Semi-automatic Techniques) introduced by Ralph De Paul
1972   * Ralph A. De Paul, Jr. co-authors revised MIL-M-24100B
1975 *   Diagnostic Logic Model hosted on a Main Frame Computer
  *   LOGMOD (LOGic MODel) first applied to a military application
1976 *   Multiple Failure Diagnostic Strategy introduced in LOGMOD
  *   LOGMOD (LOGic MODel) first applied to a military application
1977 *   LOGMOD hosted on a Portable Computer device
1978     LOGMOD available to U.S Army and hosted at Ames Research Center
  *   Automated Logic Test Structures (LTS) from Logic Model introduced
1980   * ARINC evaluates LOGMOD as a Testability Tool
1981 *   Model-Based Troubleshooting using a battery-operated devise (prototype)

SAMA (Stand Alone Maintenance Aid)  prototype Electronic Troubleshooting device

1983 *   SAMA-3 Model-Based Diagnostics applied to Crash Battle Damage Repair (CBD)
    * DSI, under subcontract to U.S. Navy, co-authors MIL-STD-2165
1986   * MIL-STD-2165 released

WSTA (Weapon System Testability Analyzer) and IDSS concept introduced

    * DSI sub-contracted to co-develop WSTA
    * DSI selected to procide expert input to GIMADS (new Integrated Diagnostic Standard)
1988 *   STAT (System Testability Analysis Tool) Licensed in U.S. and U.K
1989   * WSTA completed and available for U.S. DoD
  *   TYX and DSI develop Testability to TPS interface (SPIFI)
1991   * MIL-STD-1814 Integrated Diagnostic Standard released

AI-ESTATE introduced          

  *   DSI and Raytheon develop CAD/CAE Import to STAT (via MENTOR2STAT)
1994   * “Father of Testability”, Ralph A. De Paul, Jr. receives “John Slattery Award”
1996 *   eXpress by DSI, first licensed and available to industry
* DSI and TYX establish strategic partnering approach to test set development filling the void between design and system test.
* eXpress by DSI becomes the first tool to employ the graphical approach to diagnostic modeling
1998 * eXpress becomes the first hybrid testability tool addressing both failure mode and functional dependencies
2001 * DSI Introduces DIAG-ML. A diagnostic data exchange XML format
* DSI and Northrop Grumman team to make "IVHM". A new industry-wide "household" term for future diagnostic requirements
2002 * First time integration of full FMECA capabilities (import, generation, export, and reporting) into a testability tool eXpress
2003   * DSI together with Boeing, develop the largest known testability model.
2003 * EDDIE, by DSI, demonstrates all phases of the system engineering application of diagnostic conceptual design,
development, and deployment.

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