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Formal Information-Based Standards for Test and Diagnosis. John W. Sheppard, Co-Chair Mark Kaufman, Co-Chair Diagnostic & Maintenance Control IEEE SCC20. System Complexity. Modern systems and products are complex. Test systems required to support products are equally complex.

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formal information based standards for test and diagnosis

Formal Information-Based Standardsfor Test and Diagnosis

John W. Sheppard, Co-Chair

Mark Kaufman, Co-Chair

Diagnostic & Maintenance Control

IEEE SCC20

system complexity
System Complexity
  • Modern systems and products are complex.
  • Test systems required to support products are equally complex.
  • Managing complexity involves:
    • Controlling risk and cost.
    • Intelligent distribution of resources.
    • Management and integration of information from these distributed sources.
    • Definition of unambiguous information requirements through a common language.
requirement interdependence
Requirement Interdependence
  • Testability requirements are based on system specifications.
    • Testability metrics not precisely defined or have multiple definitions.
    • Existing tools/methods calculate metrics differently.
    • Metric ambiguity is driven by existing guidelines (e.g., MIL HDBK 2165):
  • Test requirements are established to satisfy testability goals.
    • Often tied to ATS architecture.
  • No standard way to specify test requirements.
  • Therefore …
dmc scope
DMC Scope
  • Effective management of test and maintenance information is critical.
    • The test and maintenance engineering process is, by nature, highly distributed.
    • The information requirements to support test and maintenance engineering are highly diverse.
  • DMC standards focus on reducing the cost and risk of managing the information required for test and maintenance.
the focus
The Focus
  • Communication!!!
  • Communication requires prior agreement on the characteristics of the message.
    • Structure
    • Content
  • In test and diagnosis, this equals information exchange among and between test assets and maintenance organizations.
information based architecture
Information-Based Architecture

Communications Backbone

Diagnostic

System

Test

System

Historical

Data

System

Under

Test

Application

Executive

an information based approach
BIT

Codes

diagnose

fault

repair

TOs

An Information-Based Approach

Information Framework

EXPRESS

(Information Models)

IDEF1x

(Data Models)

IDEF0

(Activity Models)

Define Test &

Diagnostic Process

Capture Required

Information

Implement Information

System

information model
Information Model
  • Definition: An information model is a formal description of types (classes) of ideas, facts, and processes that together represent of a portion of interest of the real world.
  • Purpose: To identify clearly the objects in a “domain of interest” to enable precise communication about that domain.
  • Components: objects or entities, relationships, constraints.
  • Outcome: Unambiguous exchange of information between systems.
integrating test diagnostic information
P1598 TeRM

Test & Diagnostic

Information Framework

P1232 AI-ESTATE

P1522 Testability

Pxxxx SIMICA

Test & Diagnostic Data

Test

Data

Diagnostic

Data

Product

Data

History

Data

Integrating Test & Diagnostic Information
the standards
The Standards
  • IEEE P1232—Standard for Artificial Intelligence Exchange and Service Tie to All Test Environments (AI-ESTATE).
  • IEEE P1522—Standard Testability and Diagnosability Characteristics and Metrics.
  • IEEE Pxxxx—Standard Interface for Maintenance Information Collection and Analysis (SIMICA).
  • IEEE P1598—Standard for the Test Requirements Model (TeRM)
ieee p1232 ai estate
IEEE P1232—AI-ESTATE

P1232

  • Define information for system test and diagnosis.
  • Exchange diagnostic information between applications.
  • Support modular diagnostic architectures.
  • Support interoperability with other test assets.
ieee p1522 testability diagnosability
IEEE P1522—Testability/Diagnosability

P1232

P1522

  • Define fundamental information for testability analysis.
  • Tie definitions to standard models—eliminate ambiguity.
  • Derive metrics and characteristics based on fundamentals.
  • Provide foundation for extension and expansion.
ieee pxxxx simica
IEEE Pxxxx—SIMICA

P1232

P1522

Pxxxx

  • Define information domain of system maintenance.
  • Support capture of historical maintenance/diagnostic data.
  • Facilitate discovery/extraction of maintenance knowledge.
  • Provide foundation for diagnostic and product maturation.
ieee p1598 term
IEEE P1598—TeRM

P1598

P1232

P1522

Pxxxx

  • Provide formal description of product behavior under test.
  • Define formal semantics for test requirements.
  • Feed entire product lifecycle (concept to field)
  • Emphasize “what” to test, not “how” to test.
risk reduction
Risk Reduction
  • Optimizes use of test equipment/ resources and maintenance information to maximize availability.
  • Promotes test effectiveness through requirements-driven test engineering.
  • Provides means to develop strategy for test and diagnostic effectiveness assessment (testability and diagnosability).
  • Facilitates unambiguous testability prediction and validation to ensure weapon system support specification compliance.
  • Promotes cost-effective development and integration of state-of-the-art COTS products into ATS.
  • Promotes flexibility in diagnostic architectures through separation of data and process.
life cycle cost reduction
Life Cycle Cost Reduction
  • Supports advanced diagnostic technologies to improve product maintenance.
    • Helps to find bad actors and target maintenance problems.
  • Provides a foundation for integrating test assets with other RMT analysis tools and methods.
    • Supports trade-off and competition among COTS tools to reduce ATS development cost.
    • Facilitates integration with related standards efforts (e.g., PLCS) to broaden resource base.
  • Provides foundation for closed-loop corrective action analysis.
    • Supports diagnostic process improvement/maturation to reduce field test and maintenance cost and maximize availability.
industry interest involvement
Industry Interest/Involvement
  • Committee Membership
    • Industry (ARINC, Boeing, Honeywell)
    • Tool Developers (DSI, QSI, HSI)
    • US DoD (All services)
    • Academia (Vanderbilt, NPG, U Conn)
  • Industry Interest
    • OSA-CBM
    • PLCS/STEP
    • NASA
    • NxTest
call for participation
Call for Participation
  • We are looking for help:
    • Provide technical support and participation in the committee’s work.
    • Promote objectives of the standards in service organizations.
    • Promote objectives of the standards with contractors.
    • Incorporate DMC standards in AMB initiatives (e.g., NxTest).
contact information
Contact Information
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