HBT Solution - Part 3 of 6
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A presentation highlighting how stage 4 of HBT helps to define quality levels better and test adequacy.
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HBT Solution - Part 3 of 6
- 1. BETTER DEFINITION OF QUALITY LEVELS AND TEST ADEQUACY 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 stages effectiveness guaranteed • 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 4 (Devise Proof) - Part 1 Key focus: Staged quality, Test assets organization, STEM discipline D3 (Test strategy and planning) Problems addressed: • Defects are uncovered late in life cycle delaying the release and impacting revenue plan • Specialization in specific types of test for an individual will help but focus is missing • Poor estimation resulted in cost over run in many projects • Test execution taking more time and money but unable to show ROI (Return on investment) Copyright 2011. STAG Software Pvt Ltd. All rights reserved. 5
- 6. HBT Stage 4 (Devise Proof) – Part 2 Key focus: Test design techniques, Test case architecture, STEM discipline D4 (Test design) Problems addressed: • Test design is evolving and test cases are added continuously till the end of project resulting in re-planning many times • Test design phase taking significant time • Defect escapes are traced to poor design quality • Unable to demonstrate adequacy of test assets • There is a feeling that tests are more conformance oriented (+ve only not robust) • Test cases attributes captured not helping in prioritizing during execution and selection for automation focus Copyright 2011. STAG Software Pvt Ltd. All rights reserved. 6
- 7. Summary Using D3 (Strategy & Planning) and D4 (Test design), we were able to address problems stated in previous slides • Each of the above discipline has well defined steps • Key deliverables: Test strategy, Test plan, Test scenarios/cases, Fault traceability matrix, Requirement traceability matrix • STEM core concepts: Orthogonality principle, Tooling needs assessment, WBS, Quality growth principle, Techniques landscape, Process landscape, Cycle scoping, Reduction principle, Input granularity principle, Box model, Behavior stimuli approach, Complexity assessment, Operational profiling, Test coverage evaluation Copyright 2011. STAG Software Pvt Ltd. All rights reserved. 7
- 8. Thank You M C Nagaraj in.linkedin.com/in/mcnagaraj @mcnagaraj Copyright STAG Software Pvt. Ltd., 2011