HBT Solution - Part 2 of 6
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REDUCING DEFECT ESCAPE AND THERE BY MAINTENANCE COST M C Nagaraj Director – Customer Excellence in.linkedin.com/in/mcnagaraj
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Transcript of HBT Solution - Part 2 of 6
REDUCING DEFECT ESCAPE AND
THERE BY MAINTENANCE COST
M C Nagaraj
Director – Customer Excellence
in.linkedin.com/in/mcnagaraj
Copyright STAG Software Private Limited, 2009 2
Six-stage evaluation model (S1-S6)
Hypothesis Based Testing (HBT)A goal focused methodology to validation
Understand
EXPECTATIONS
Understand
CONTEXT
Formulate
HYPOTHESISDevise
PROOF
Tooling
SUPPORT
Assess &
ANALYZE
S1
S2
S3S3
S5
S6
HBT
The central theme of HBT is
“hypothesize potential defects that
can cause loss of expectations
and
prove that they will not exist”
The focus is on the goal and
how we shall achieve it
rather than the various activities
“goal-centric vs. activity-based”
Copyright STAG Software Private Limited, 2009 3
HBT and STEM
Understand
EXPECTATIONS
Understand
CONTEXT
Formulate
HYPOTHESISDevise
PROOF
Tooling
SUPPORT
Assess &
ANALYZE
S1
S2
S3S3
S5
S6
D1
D2
D3
D4D5D6
D7STEM
D8
STEM
HBT
“method”
“methodology”
GOAL
a particular way of doing something
‘defect detection technology
from STAG’
a system of ways of doing
‘goal centered scientific
approach to validation’
‘deliver clean software
quickly & cost-effectively’
“outcome”
• 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
HBT – six stage personal test methodology
Copyright 2011. STAG Software Pvt Ltd. All rights reserved. 4
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?
HBT Stage 3 (Formulate Hypothesis)
Copyright 2011. STAG Software Pvt Ltd. All rights reserved. 5
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
Summary
Copyright 2011. STAG Software Pvt Ltd. All rights reserved. 6
