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Software-Qualitätssicherung: Testen Im Software-Lebenszyklus by Paul Schmitz

Software-Qualitätssicherung: Testen Im Software-Lebenszyklus

by Paul Schmitz
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Book cover type: Paperback
  • ISBN13: 9783528035921
  • Binding: Paperback
  • Subject: N/A
  • Publisher: Vieweg+teubner Verlag
  • Publisher Imprint: Vieweg+teubner Verlag
  • Publication Date:
  • Pages: 206
  • Original Price: EUR 51.39
  • Language: German
  • Edition: 1982
  • Item Weight: 313 grams
  • BISAC Subject(s): Computer Science

Wenn Fehler in Software-Produkten während des Betriebs auftreten, ist dies nicht aus- schlie lich darauf zurückzuführen, da in der Entwicklung zu wenig getestet worden ist. Durch verschiedene Umfragen konnten Anteile des Testaufwands (einschli lich Pilottest) am Gesamtaufwand der Software-Entwicklung von bis zu 70 % ermittelt werden (siehe Abb. 0-1). Durchschnittlich kann man davon ausgehen da zwischen 30 % und 50 % des Gesamtaufwands der Software-Entwicklung für Testen aufgewendet werden. Umfrage Testaufwand (U1) 20-30 % bzw. 20-40 % (U2) 60-70% inklusive Pilottest (U3) o 30-50 % für Anwendungssoftware o 30-40 % für Systemsoftware Abb. 0-1: Aufwand des Testens als Anteil des gesamten Entwicklungsaufwands /BONS82c/ Ul: /SCHM78/; U2: /SCHM80a/; U3: /SCHM8l/ Sofern der Aufwand für Testen nicht zu gering ist, sondern vielfach als zu hoch bezeichnet wird, ergibt sich zwangsläufig die Frage nach den Ursachen für die dennoch häufig be- mängelte Qualität von Software-Produkten. Ursachen sind vielfach, da zwar eine Viel- zahl von Tests durchgeführt werden, jedoch überwiegend zum falschen Zeitpunkt und mit der falschen Vorgehensweise. Vorhandene Fehler werden zu spät gefunden, d. h. später als eigentlich möglich, wodurch zwangsläufig Folgefehler in den Entwicklungsschritten entstehen. Darüber hinaus werden teilweise Methoden verwendet, die nicht effizient sind. So werden z. B. für den Abnahmetest über einen bestimmten Zeitraum ausschlie lich Parallelläufe durchgeführt, wobei von vornherein sicher ist, da eine Vielzahl von Normal- fällen verarbeitet werden, aber die - immer wieder zu Fehlverhalten führenden - Grenz- werte oder Falschwerte nicht systematisch einbezogen werden.

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