Software Craftmanship - The Agile Way

© 2014 National University of Singapore. All Rights Reserved.
ATA/TUS-Agile/Agile Engineering Practices V1.0
SWARNALATHA ASHOK
(swarna@nus.edu.sg)
Institute of Systems Science
National University of Singapore
1
SOFTWARE CRAFTMANSHIP –
THE AGILE WAY
Total number of slides = 21
© 2014 NUS. The contents of this document may not be reproduced in any form or by any means, without the written permission of ISS, other than for the purpose for which it has
been supplied.

 Agile Software Engineering practices
 Agile Software Architecture & Design Patterns
 Pair Programming
 Test Driven Development & Refactoring Techniques
 Continuous Integration & Delivery
2
TOPICS

THE AGILE PHILOSOPHY
Response to unclear and changing requirements
 Frequent customer interaction and collaboration
 Frequent delivery of quality products
 Iterative application of supporting processes
Customer Satisfaction is the focus!
3

AGILE MIND SET VS SCHNEIDER’S CULTURE MODEL
4
Collaboration Control
Cultivation Competence
Personal Impersonal
Reality
Possibility
Are we
neglecting
this?

MANIFESTO FOR SOFTWARE CRAFTSMANSHIP
Raising the bar
As aspiring Software Craftsmen we are raising the bar
of professional software development by practicing it
and helping others learn the craft.
5

MANIFESTO FOR SOFTWARE CRAFTSMANSHIP
RAISING THE BAR
Source:http://manifesto.softwarecraftsmanship.org
6
well-crafted
software
well-crafted
software
working
software
working
software
but alsoNot only
steadily
adding value
steadily
adding value
responding
to change
responding
to change
but alsoNot only
a community
of
professionals
a community
of
professionals
individuals
and
interactions
individuals
and
interactions
but alsoNot only
productive
partnerships
productive
partnerships
customer
collaboration
customer
collaboration
but alsoNot only
That is, in pursuit of the items on the left we have found the items
on the right to be indispensable.

ESSENTIAL AGILE ENGINEERING PRACTICES
 Essential Agile Software Engineering (SE)
practices
 Agile Software Architecture & Design Patterns
 Pair Programming
 Test Driven Development & Refactoring
Techniques
 Continuous Integration & Delivery
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Organisation culture
with quality sense
Stakeholders’
support
Well disciplined team with
sound Agile SE knowledge

AGILE SOFTWARE ARCHITECTURE
An Architecture that supports change, end-user
interaction, discovery, and ease of comprehension (of
functionality)
- Jeff Sutherland
8
Leverage on
Architectural and design patterns
Complete reference models and frameworks
Iterations dedicated to architecture are useful
Document only what is needed
(diagrams, metaphors etc.)

AGILE ARCHITECTURE
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Develop Initial
Software
Architecture
Communicate
with
Stake Holders
Work
with
Developers
Refine the
Architecture
Incremental Evolution of Software Architecture
Keep it
Simple
Models
Feedback
Loop
Source: Scott W Amber
If required, dedicate a
short iteration to
prototype the
architecture
Principle: Welcome changing requirements, even late in
development. Agile processes harness change for
the customer's competitive advantage.

REFACTORING TECHNIQUES
10
Improve the design and code
Clean up the mess in the code
Find defects and reduce debugging time
Prevent “design decay” caused by extension and maintenance
Dedicate a small duration every day/beginning of an iteration
Principle: Continuous attention to technical excellence
and good design enhances agility.

TEST DRIVEN DEVELOPMENT
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Principle: Continuous attention to technical excellence
and good design enhances agility.

PAIR PROGRAMMING
12
Ensures higher quality of code
Facilitates knowledge transfer
Eliminate the ‘truck factor’

PAIR PROGRAMMING
 Mistakes get caught upfront
 shorter time-to-repair
 End defect content is statistically lower
(~15-50% gains)
 Work in pairs for critical modules
 Challenges:
 Personalities of the developers
 Off-track discussions
 Support from managers
13

CONTINUOUS INTEGRATION
 Integration proves it works, why not do it every time
some change is made?
14
Your software is broken until someone proves it
works, usually at the integration stage.
IntegrateIntegrate IntegrateIntegrate Integrate Integrate Integrate Integrate
Goal: To produce working software

CONTINUOUS INTEGRATION
15
Version
Control
Automated
Build
Team
Agreement &
Commitment
Frequent check-ins to Version Control system
Including source code, test scripts etc.
Automate TDD (include regression test cases)
Automate Build

CONTINUOUS DELIVERY
Plan DeployReleaseTestDevelop Build
Auto Build and Version Control
Continuous Integration
Continuous Delivery
Principle: Our highest priority is to satisfy the customer through
early and continuous delivery of valuable software.

CONTINUOUS DELIVERY
Software is always production-ready
Releases tied to business needs, not operational constraints
Uncovers deployment issues early
Improved software quality
Requires automated tools

CONCLUSION
18
Agile MethodsAgile Methods
Individuals and
interactions
Individuals and
interactions

Agile SE practicesAgile SE practices
Responding to
change
Responding to
change

Agile SE practicesAgile SE practicesWorking softwareWorking software 
Agile MethodsAgile Methods
Customer
collaboration
Customer
collaboration

Agile Mindset

CONCLUSION
19
Agile
Mindset
Agile
Methods
Agile SE
Practices
Happy Customer
Quality software

20
NUS-ISS AGILE TRAINING
ROADMAP
Project
Management
Software
Engineering
Foundation Intermediate Advanced
PMI Agile Certified
Practitioner (PMI-ACP)®
Preparatory Course
(3 days)
NICF – Essential
Practices for Agile Teams
(Certified Scrum
Developer)
(3 days)
NICF – Business Analysis
for Agile Practitioners
(2 days)
NICF – Object Oriented
Design Patterns (4
days)
NICF – Agile Continuous
Delivery
(3 days)
NICF – Certified
ScrumMaster (3 days)
NICF – Architecting
Software Solutions
(5 days)
NICF – Software Testing
(3 days)
NICF – Object Oriented
Analysis & Design (5 days)

THANK YOU
21

Software Craftmanship - The Agile Way

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