HBT Solution - Part 2 of 6
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A presentation highlighting how stage 3 of HBT helps to reduce defect escape and thereby reduce maintenance cost.
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HBT Solution - Part 2 of 6
- 1. REDUCING DEFECT ESCAPE AND THERE BY MAINTENANCE COST M C Nagaraj Director – Customer Excellence in.linkedin.com/in/mcnagaraj
- 2. Hypothesis Based Testing (HBT) A goal focused methodology to validation Six-stage evaluation model (S1-S6) S6 S1 Assess & Understand The central theme of HBT is ANALYZE EXPECTATIONS “hypothesize potential defects that can cause loss of expectations and S5 Tooling HBT Understand S2 prove that they will not exist” SUPPORT CONTEXT Devise Formulate The focus is on the goal and PROOF HYPOTHESIS how we shall achieve it rather than the various activities S3 S3 “goal-centric vs. activity-based” Copyright STAG Software Private Limited, 2009 2
- 3. HBT and STEM “outcome” ‘deliver clean software S6 S1 GOAL quickly & cost-effectively’ Assess & Understand ANALYZE EXPECTATIONS D8 D1 Tooling D7 D2 S5 SUPPORT STEM Understand S2 “methodology” D6 D3 CONTEXT HBT a system of ways of doing D5 D4 ‘goal centered scientific approach to validation’ Devise Formulate PROOF HYPOTHESIS S3 S3 “method” STEM a particular way of doing something ‘defect detection technology from STAG’ Copyright STAG Software Private Limited, 2009 3
- 4. HBT – six stage personal test methodology • Key focus in each stage • Empowered by scientific approach using eight disciplines (D1 to D8) of STEM • 32 core concepts address factors like effectiveness, consistency, scalability, efficiency, visibility and agility of test methodology • The outcome of each stage are well defined Copyright 2011. STAG Software Pvt Ltd. All rights reserved. 4
- 5. HBT Stage 3 (Formulate Hypothesis) Key focus: Cleanliness criteria, multiple view points, STEM discipline D2 (Defect Hypothesis) Problems addressed: • Defects are escaping to production and resulted in customer dissatisfaction • Spending high maintenance cost than planned • Unable to understand customer expectation upfront • How can we prove that we have sufficient test cases for product under test? Copyright 2011. STAG Software Pvt Ltd. All rights reserved. 5
- 6. Summary Using D2 (Defect Hypothesis) we were able to address problems stated in previous slide • This has well defined 4 steps • Key deliverables: Potential defect catalog, Fault traceability matrix • STEM core concepts: EFF model, Defect centric principle, Negative thinking, Orthogonality principle This personal discipline instills a defect-centric thinking by hypothesizing potential defects and thereby be intensely goal focused Copyright 2011. STAG Software Pvt Ltd. All rights reserved. 6
- 7. Thank You nagaraj@stagsoftware.com @mcnagaraj Copyright STAG Software Pvt. Ltd., 2011