This document provides an overview of defect prevention strategies and the roles of quality assurance (QA), quality control (QC), and testing in the software development lifecycle. It discusses who is responsible for quality and defines the differences between QA, QC and testing. QA focuses on processes and preventing defects, QC focuses on product testing and finding defects, and testing identifies bugs. The document also outlines defect prevention techniques used in each phase of development and the activities QA engineers perform pre-production, during production, and post-release.

1. DEFECT PREVENTION GUIDE
IN THE PRODUCT COMPANY

2. ABOUT
• 7 years in IT
• 3 years at
Wargaming
• Web testing
• Integration testing
• Test management
• People management

3. OVERVIEW
• Product quality
• Quality assurance
• Defect prevention
• Main techniques
• Software development lifecycle and
role QA Engineer in it

4. PRODUCT QUALITY
• Who is responsible for quality?

5. WHO IS …?

6. WHO IS WHO?
Quality
assurance
Quality
Control
Testing

7. QA/QC/TESTING
# Quality Assurance Quality Control Testing
1 Activities which ensure the
implementation of processes,
procedures and standards in
context to verification of
developed software and intended
requirements.
Activities which ensure the
verification of developed
software with respect to
documented (or not in some
cases) requirements.
Activities which ensure
the identification of
bugs/error/defects in
the Software.
2 Focuses on processes and
procedures rather then
conducting actual testing on the
system.
Focuses on actual testing by
executing Software with intend to
identify bug/defect through
implementation of procedures
and process.
Focuses on actual
testing.
3 Process oriented activities. Product oriented activities. Product oriented
activities.
4 Preventive activities. It is a corrective process. It is a preventive
process.
5 It is a subset of Software Test Life
Cycle (STLC).
QC can be considered as the
subset of Quality Assurance.
Testing is the subset of
Quality Control.

8. WHAT IS DEFECT
PREVENTION?
Defect Prevention is a strategy applied
to the software development life cycle
that identifies root causes of defects
and prevents them from recurring

9. PRICE OF MISTAKE
160
140
120
100
80
60
40
20
0
Requirements Design Code Test Production

10. TECHNIQUES
• Requirements testing
• Code review
• Test Cases review
• Risk analysis
• Root cause analysis
• Retrospective

11. DEVELOPMENT LIFECYCLE

12. ROLES IN PRODUCT COMPANY

13. PRE-PRODUCTION QA ACTIVITIES
Name QA Team QA Tech
Lead
High Level
Require-ments
I R
Design
Mockups
I I

14. PRODUCTION QA ACTIVITIES
• Create documentation:
– Master Test Plan
– Version/Integration Test Plan
– Test Summary Report/
Integration Report
– Test Cases/ Checklists/
Automation Scripts
• Review:
– LLR
– Project Version Plan
– Project Report
– Architecture/ Tech Docs
– Release

15. POST-RELEASE QA ACTIVITIES
Name QA Team QA Tech
Lead
Product
Post-
Release
Report
I I
Release
Postmortem
Report
I I

16. Summary
• Not only QA Engineers responsible
for quality
• The best way to avoid problem – to
prevent it
• QA Engineers should be involved in
all phases of software development
lifecycle

17. Questions?
Lyudmila Fedchuk
l_fedchuk@wargaming.net