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Quality Management

"Quality Management: How is quality defined - agile versus plan driven approaches"

Kvalitet kan deles ind i 3 kategorier

  • Produkt kvalitet
  • Process kvalitet
  • Forventingskvalitet

Dårlig kvalitet kan koste

  • Tab

  • Spildt arbejde

  • Vedligeholdelse er ofte dyrere end udvikling

Software Qualities

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Trade-off

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Quality Management

  • Quality Assurance
    • Planlægge eller designe processer for at undgå dårlig kvalitet
  • Quality Control
    • Det at overvåge at work products overholder kvalitetsstandarder

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  • Lav quality management er billigt i starten, men bliver dyrerer og dyrerer

  • Høj quality management har initial cost, men bliver billigere senere fordi der sker færre fejl, og koden er mere stabil

  • Det handler om at finde en balance

Validation and Verification

Validation

  • Bygger vi de rigtige systemer?
  • Overholder kundens forventninger og erfaringer

Verifikation

  • Bygger vi systemet ordenligt?
  • Overholder specifikationer
  • Objektiv process
  • Tjekker om softwaren er af høj kvalitet, men ikke om det er brugbart

Teknikker

  • Testing af programmer og prototyper
  • Reviewing af specifikationer, dokumentation og programmer

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Inspection

Verifikation, tjekker om specifikationerne overholdes, men ikke med kunden.

Tjekker ikke ikke-funktionelle karaktaristika såsom reliability og maintainability.

Menneske-baseret tjek af dokumenter og filer såsom kode.

  • Ikke eksekvering af kode

Testing

Validation, da vi tester produktet eller prototyper.

Eksekvering af kode.

Peer Review

Software review, work product undersøges af skaber, samt en eller flere kollegaer.

  • Evaluerer teknisk indhold og kvalitet.

V-Modellen

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Test and Review in Models

Waterfall

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Incremental and Iterative

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Integration and Configuration

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Quality in Agile

  • Definition of Done

    • Team agree on what criteria must be met before a task is complete
  • Sprint Review

    • Product Owner and other stakeholders validate the sprint delivery meets expectations
  • Check before check-in

    • Developers are responsible for organizing their own code reviews with other team members before the code is checked in to the build system
  • Never break the build

    • Team members should not check in code that causes the system to fail

      Developers have to test their code changes against the whole system and be confident that these work as expected

  • Fix problems when you see them

    • If a programmer discovers problems or obscurities in code developed by someone else, they can fix these directly rather than referring them back to the original developer

Pair Programming in XP

  • Flere programmeringstimer i stedet for procrastinating
  • Stamina og insight i koden hvis en i parret er syg
  • Real-time code review

Last update: January 22, 2020