Agile Workshop: Releasing Quality Software

Chennai Agile Workshop
20th March 2009

Releasing Quality Software
By

Balaji D Loganathan
Agile Java Architect and Co-Founder, Spritle

SPRITLE Software (P) Limited http://www.spritle.com
Your partner in Distributed Agile
info@spritle.com

About the Speaker
Agile Java Architect and Co-Founder,


Spritle Software –A recent Startup
Around 10 years of experience in IT Field


6 years of experience in enterprise Java


5 years of service to United Nations, Swiss


B.E / India; Master’s in IT / Australia


Moderator at Javaranch


UNeDocs India Focal Point


Certified SCRUM Master and Agile


Practitioner
info@spritle.com

Agile Quality
Can Agile software development
techniques and practices delivers
quality software than the traditional
software teams ?
Can Agile helps me to cut cost spent
on Quality checking ?

info@spritle.com

What is ‘Quality Software’ ?
 In the context of software engineering, software quality
measures how well software is designed (quality of design),
and how well the software conforms to that design (quality
of conformance), although there are several different
definitions. [Source: Wikipedia]

 Steve McConnell’s Code Complete divides software as
“Internal and External Quality Characteristics”

 Dr. DeMarco says “a product’s quality is a function of how
much it changes the world for the better – In other words
User Satisfacation ”

info@spritle.com

Quality in Agile – What ?
 Agile Manifesto

 Working software over comprehensive
documentation

 Agile Principles

 Working software is the primary measure of
progress.
 Continuous attention to technical excellence
and good design enhances agility.
 The best architectures, requirements, and
designs emerge from self-organizing teams.

info@spritle.com

Quality in Agile – How ?
Incremental delivery
Continuous Quality Assurance

Test Driven Development
Refactoring

Continuous Integration

info@spritle.com

Incremental Delivery - I

Picture taken from http://epf.eclipse.org/wikis/scrum/

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Incremental Delivery - II
Set Quality with ‘Definition of Done’
 Code produced (all 'to do' items in code completed)
 Code commented, checked in and run against current version
in source control
 Builds without errors
 Unit tests written and passing
 Deployed to system test environment and passed system tests
 Passed UAT (User Acceptance Testing) and signed off as
meeting requirements
 Any build/deployment/configuration changes
implemented/documented/communicated
 Relevant documentation/diagrams produced and/or updated
 Remaining hours for task set to zero and task closed

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Incremental Delivery - III
Scope of ‘Done’ changes

Source: Kent’s Presentation

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Incremental Delivery - Benefits

Faster ROI from deployment of more
valuable software
Frequent releases helps understand
requirements better and implement
valuable piece of the product
Lower cost of quality
The earlier we catch bugs, the less they
cost to fix

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Test Driven Development - I

Design

TEST TEST

Implement

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Test Driven Development - II

info@spritle.com

Test Driven Development - III
Refactoring
• “change to the internal structure of software
to make it easier to understand and cheaper
to change, WITHOUT changing the
observable behaviour” (Martin Fowler, 1999)
Code smells
Duplicated Code
Long Method
Long Loop
Extract Method
info@spritle.com

Test Driven Development - Benefits

 Stability
 Accountability
 Improvement in code quality
 Ease of maintenance
 Reduced bugs
 Ease of upgrade
 Reduces production ‘surprises’
 Higher developer confidence
 Separated Concerns
info@spritle.com

Continuous Integration - I
Automated Build and Test as
Changes Occurs
The CI Server sits on a clean, non-
developer machine and rebuilds your
project every time someone commits
new changes
May include “Agile Metrics”

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Continuous Integration - II

Source http://blog.briandicroce.com/2008/03/

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Continuous Integration - III

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Continuous Integration - Benefits

 Early detection of errors
 Reducing slipping of schedule caused by
significant time losses
 Reducing and oftentimes eliminating loss
of productivity caused by code base
breakage
 Increasing team morale and helping to
maintain capable engineers on board
 Reducing development time and hitting
the market before competitors
info@spritle.com

What can affect Quality in Agile ?

Overtime and Weekends
Cut Testing (unit, acceptance,
performance)
Cut review (design, code)
Don’t follow standards
No refactoring

info@spritle.com

Agile Quality - Implications
 Greater quality implies less need for
quality assurance activities

 Evolving Artifacts

 Multi-Skilled Team

 Agile shifted our attention to small teams
incrementally delivering quality software
• Testing at the end is no longer applicable

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Agile Quality - Areas
 Phases
 Release Cycles
 Iteration Cycles
 Development Cycles
 Types:
Engineering Testing (Unit and Integration)

User Functionality Testing

Acceptance Testing

Regression Testing

Exploratory Testing

Performance and Scalability Testing


info@spritle.com

Thank You

Question ?

Balaji D Loganathan, Spritle Software
bloganathan@spritle.com
info@spritle.com

Agile Workshop: Releasing Quality Software

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