The Pursuit Of Defect Reduction
Post on 31-Jan-2015
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Wesley NitsckieMarlon Parker
Agenda
Background
“I’d rather have it wrong than have it late. We can always fix it later”
Background
Introduction
• Software is part of everyday life• High costs associated with poor
quality• Software quality assurance has been
given a low priority in SDLC
Introduction
Software Quality
•What is software quality?–Measures how well software is
designed (quality of design)–How well the software conforms to
that design (quality of conformance)–Fitness for use
Software Quality
• Case: Mobile messaging company– Pilot Study– Landscape
• Semi-structured interviews• Identify stakeholders, SDLC processes, organisational
flows– 2 Software development Projects
• Project A – QA at the end of SDLC process• Project B – QA throughout the SDLC process• Comparison of metrics
Research Methodology
Project A
Research Methodology
Project B
Research Methodology
• Project A:– Defects reported was 17 and took 4 days to fix.
• Project B:– Defects reported was 3 and took 3 hours to fix.
• Difference in time• Cost implications• Number of defects was reduced
Discussion of Findings
• Spend more time fixing than developing• QA early in SDLC reduces software defects and
costs• QA does not eliminate defects completely• QA should be woven through the fabric of the
SDLC
Conclusion
• Thank you
The End
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