Introduction Improvement of Error Rate

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IntroductionImprovement of Error Rate
Error Rate
_______ Old methodology - - - - - - New
methodology
Test Time
Source Software Process Improvement with SDL,
K. Kimbler, G. Opsahl, SDL Forum 1995
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Specification and Description Language

• International Standard (ITU-T, Z.100)
• Formal description technique
• Easy to understand both for creators (direct
  users) and viewers (non constructors of
  specifications) (graphical representation)
• Object oriented language
• Independent of design paradigm (e.g. function or
  object oriented)
• Independent of implementation (language,
  software, and hardware)

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SDL History

• SDL-76 First version. Only recommendations on
  how to draw process graph
• symbols (Behavior).
• SDL-80 Blocks are introduced (Architecture),
  PR-form (textual Phrase Representation)
• becomes a part of the language
• SDL-84 The abstract data type concept is
  introduced (Data). Additional concepts
• are introduced.
• SDL-88 Only minor changes
• SDL-92 Object-oriented extensions to SDL
• SDL-96 Minor changes (e.g. external procedures)

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Standards Organizations, Corporations

• ITU International Telecommunication Union
  since 1993.
• Previous name CCITT (Comité Consultatif
  International
• Telegraphique et Telephonique).
• ETSI European Telecommunications Standards
  Institute
• ISO/IEC International Organization for
  Standardization,
• International Electronical Commission
• Others ANSI, IEEE ...

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SDL A Formal Language

• The representation technique is formal if the
  techniques interpretation model is formally
  defined guaranteeing that no ambiguities can
  occur.
• i.e.
• An ambiguity based on the interpretation model is
  an error and can automatically be detected.

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TAU Users

• Telecom Industry Standard Bodies
• BT Adtranz ITU, ETSI, ANSI,
• Deutsche Telecom Atlas Copco TTC
• Korea Telecom ATT Bellcore
• Sprint Alcatel EWOS
• NTT Bosch EURESCOM
• Telia Celsius Tech NIST
• Telebras Ericsson Arinc
• Telefonica Fujitsu
• Gambro
• Defense IBM
• Nera Intel
• NL Defence Lucent Technologies
• Siemens Defence Motorola
• Universities Nokia
• Worldwide Siemens
• Nortel

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Abstraction - Architecture - Hierarchy
Visitors
Ape
Zoo staff
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Behavior - Application Independent
Ape
Production
Process
Stocks_ Empty
hungry
State
Material
Event
Banana
eat
Action
produce
Thanks
Ready
Result
Stocks Full
New State
satisfied
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First ImpressionsClasses and Objects
Type
Instances
Orang-Utan APE
Gorilla APE
APE
. APE
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First ImpressionsMSC Temporal Events
Ape
everyone else
Ape
everyone else
Banana
Ball
Thanks
Yawn
Scenario 1
Scenario 2