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Yellow Book User Group 5 Developing Yellow Book 4

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A look outside Rail. European Air Traffic Management. New ... New technology to counter problems with obsolescence and increasing Whole Lifecycle Costs ... – PowerPoint PPT presentation

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Title: Yellow Book User Group 5 Developing Yellow Book 4


1
Yellow Book User Group 5Developing Yellow Book 4
  • Updating Risk Management Techniques

2
A look outside Rail
  • European Air Traffic Management
  • New Regulations e.g. SMS, TLS Safety Cases
  • Continued harmonisation towards Target
    Architecture
  • Military and Civil Avionics
  • New technology to counter problems with
    obsolescence and increasing Whole Lifecycle Costs
  • Increasing use of Commercial Off the Shelf
    components
  • Desire to make Re-certification easier and cheaper

3
Impact on Risk Assessment
  • Objective Based Standards
  • ESARRs introduce TLS and Safety Objectives
  • New version of Def Stan 00-56 (say goodbye to
    SILs?)
  • Target Level of Safety
  • One target for all Civil airspace
  • New Technology (such as IMA)
  • Increases complexity of certification
  • Introduces large scale integration of
    functionality
  • Increased desire to use COTs

4
Objective Based Standards
  • Example from CAP 670 SW01

5
Risk Management Methodologies
  • Greater rigour in generating Safety Requirements
  • Facilitates apportionment of TLS
  • Ensures identification of Safety Properties as
    well as Evidence Assurance Levels
  • Use of Risk Directed techniques
  • Use safety properties to help define design,
    tailor development and focus certification
  • Build safety cases using formal argument
    semantics
  • Use of Modular Safety Cases
  • To support certification of system of systems
  • To ease re-certification

6
Risk Directed Approach
7
Building an Argument
8
Modular Certification
  • Establishes a basis for
  • building Safety Cases for a system of systems
  • incremental certification
  • a more efficient re-certification process
  • Based on
  • self-contained Modular Safety Cases
  • contracts between modules

9
Benefits
  • Overall approach still supports existing
    standards infrastructure and aids transition
  • Provides a robust framework for
  • certifying COTS, Legacy and
  • products certified to other standards
  • Helps to focus on what is being certified not how
    it is being certified
  • Although how is still important!
  • Experience to date suggests new techniques
    provide greater confidence at less cost

10
Implications for YB4
  • Basis for Objective Based approach already
    present in Fundamentals
  • Need to consider improvements to
  • Safety Requirements Engineering
  • Risk Assessment Techniques
  • Safety Case Construction
  • Can also benefit Programme Risk Management
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