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Conclusions
Retention is a business issue
not an afterthought
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copyright BAE SYSTEMS 2005
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Long Term Data Retention
Sean BarkerBAE SYSTEMS, Advanced Technology Centre
With thanks to LOTAR, AIA & PDES
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Contents
• From Drawings to Models• Changes in IT Environment• Scope of the problem• Approches
– OAIS– LOTAR– Immortal Information
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A Brief History of CAD
Manual Drawing
ProductModellingPart model includes shape,
materials, tolerances
GeometryModelling
Part shape is modelled to
produce drawings more easilyComputer as
Electronic pencil
Automated redrawing after small changes
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What is the master?
Drawing is the masterManual Drawing
GeometryModelling
Computer asElectronic pencil
ProductModelling
Model as master
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copyright BAE SYSTEMS 2005
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Contents
• From Drawings to Models
• Changes in IT Environment• Scope of the problem• Approches
– OAIS– LOTAR– Immortal Information
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Rates of Change
Life of CAD System: 10 years
Time between CAD Versions: 6 months
Life of Computer: 3 years
Life of Operating System: 18 months
Life of Product: 70 years +
time
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An Example of Generation Change
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Implications
When we update a model in 20 years time:• CAD System replaced twice• The hardware replaced 6 times
Given old software on an old computer, we need person who remembers how to use it.
Chances of reading old CAD data?
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copyright BAE SYSTEMS 2005
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Contents
• From Drawings to Models• Changes in IT Environment
• Scope of the problem• Approches
– OAIS– LOTAR– Immortal Information
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Retention or Archiving?
Length of TimeLength of Time
Long TermMedium Term
Short Term
Long TermLong TermMedium TermMedium Term
Short TermShort Term
InvarianceInvariance
Digital SignatureDigital SignatureAuditable
Implicit
Not Required
AuditableAuditable
ImplicitImplicit
Not RequiredNot Required
ObjectivesObjectives
LO
NG
TE
RM
AR
CH
IVIN
GL
ON
G T
ER
M A
RC
HIV
ING
RE
TE
NT
ION
RE
TE
NT
ION
Legal Req.
Business Req.
Legal Req.Legal Req.
Business Req.Business Req.
Preserve OriginalKeep data available
ReusePreserve Source
Preserve OriginalPreserve OriginalKeep data availableKeep data available
ReuseReusePreserve SourcePreserve Source
Stored FormStored Form
Representation
Format
Detail Level
RepresentationRepresentation
FormatFormat
Detail LevelDetail Level
Native Format
Standardized Format
Accurate
Approximate
Presentation
Native RepresentationDerived Representation
Native Format
Standardized Format
Native FormatNative Format
Standardized FormatStandardized Format
Accurate
Approximate
AccurateAccurate
ApproximateApproximate
Presentation
Native RepresentationDerived Representation
PresentationPresentation
Native RepresentationNative RepresentationDerived RepresentationDerived Representation
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Scope of the Problem
• Keep Hardware out of scope
• Keep Data OAIS Repository
• Keep Information LOTAR
• Keep Knowledge Immortal
Information
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copyright BAE SYSTEMS 2005
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Contents
• From Drawings to Models• Changes in IT Environment• Scope of the problem
• Approches– OAIS– LOTAR– Immortal Information
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OAIS Overview
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OAIS
• Standard to compare Archive systems• Covers Producer to Consumer• Defines
– terms– processes– NOT data formats
• Ingest agreement
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LOTAR
Developing European Aerospace Standard• Detailed guidance for
– CAD– PDM– etc (but later)
• Data Validation• Information Authentification
Harmonize with AIA (US Aerospace)
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Key Issue - Retention is not an Afterthought
Design
ArchiveApprovalDecision
Fit toArchive
Usenow
Retention Integral to Design
Design
Archive
ApprovalDecision
Fit toArchive
UseNow
Archiving as Afterthought
Automatic, low cost, can be part of QA
Manual, high cost
Money downdrain
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LOTAR, AIA, PDES and IAQG
7E7 - SSDBSAerospace Industries Association Working Group
Chair:Rick Zuray
7E7 - SSDBSAECMA-STAN LOTAR Working Group
Chair:Jean-Yves Delauney
7E7 - SSDBSPDES Inc. LDTR Working Group
Chair:Gerald Graves
Detailed working group structure
AQG Reps Airframe Defense & Space Regulatory Agencies Supply Chain Other
AAQG
APAQG
EAQG
Alenia
Airbus
BAE
Boeing
Canadair
Embraer
GAMA
Gulfstream
Raytheon
Fokker
Cessna
Bombardier
Vought
MTU
Mitsubishi
Kawasaki
Eurocopter
Pratt Whitney
Rolls Royce
GEEADS US DoD
NASA
NASDA
ESA NATO
Lockheed Martin
Northrop Grumman
EASA
FAA
JAA
JCAB
DAC
CAA
Transport Canada
LTDR Forum
International Aerospace Quality GroupLong Term Archival & Retrieval Project
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Immortal Information
What should we archive?• What is the basic information?• What is the configuration information?• What is the context information?• What is the validity information?
What about the Rationale?
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SGML
ASCITEXT
HTML
Basic File Formats
Example Retention Package
CADFile
ValidationProperties
ProjectStandards
Design OfficePractices
MaterialsHandbook
GD&TStandards
Supporting Documentation
10303-203AP 203 Ed 2
AP203Recommended
PracticesSTEPMod
10303-11Express
XML XSDXML Tag
Definitions
10303-21file
10303-28XML Binding
XML BindingConfiguration
STEP
File Format
CompanyProcess
DesignerApprovers
PersonnelRecords
QualificationsList
Proof of good practice
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Conclusions
• Long term retention is a complex problem• OAIS covers the general concept of archiving• AIA & LOTAR specialise OAIS for Aerospace• LOTAR adds details for CAD, PDM, etc• Immortal Inforamtion will look at what should
be retained
Retention is a business issuenot an afterthought