Secret Assumption of Agile

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Early proponents of Agile assumed a certain style of programming that was an outgrowth of the Simple Design practice of eXtreme Programming. As Agile has been adopted, this particular style was not brought in as a co-requisite. This presentation explains aspects of this style, cites examples of the impact of its use, and describes a training program developed by Fred George to address this deficiency. This training program formed the basis of ThoughtWorks University several years after its creation. (Presentation given at Agile India 2013)

Tecnologia

The Secret
Assumption
of Agile
Fred George
fredgeorge@acm.org
@fgeorge52

Copyright © 2009-2013 by Fred George 1

Agile is Productive
Traditional Agile
3 Months
12 Months 8 Months.............
5 Months
8 Months

$28 / Hour $87 / Hour

$2,000,000
6x $1,100,000

Copyright © 2009-2013 by Fred George 2

How?

1. Code That Can Change
2. Lean Management
3. Processing Power

Copyright © 2009-2013 by Fred George 3

“Objects are only good for
programs that change.”
Rick DeNatale, IBM
1988

Copyright © 2009-2013 by Fred George 4

Stories Assume Easy
Change

Copyright © 2009-2013 by Fred George 5

Typical Program
public void foo( ) {
... How many lines?
...
...
...
... 2.3 lines / method
... 25 lines / class
...
... Smalltalk:
} 1.1 lines / method
Copyright © 2009-2013 by Fred George 6

Replacement Application
Old New

Java Java

Oracle DB Oracle DB

Web UI Web UI

72 Classes 1400 Classes

Copyright © 2009-2013 by Fred George 7

Tasking Cycle
Task
Integrate Design

Ship Code Test
Copyright © 2009-2013 by Fred George 8

Task Cycle Case Study
Task
Integrate Design
1,000,000 Lines of J2EE Code

2-4 Hours 50 Programmers
4000 Tests
Cycle Time?

Code Test
Copyright © 2009-2013 by Fred George 9

Tasking Cycle
Task 15 Minutes
Integrate Design

15 Minutes

Code Test
Copyright © 2009-2013 by Fred George 10

Simple Design
1. Works
2. Communicates
3. No duplicate code
4. Least classes and methods

Applies to Application and Tests

Copyright © 2009-2013 by Fred George 12

Refactoring
Martin Fowler

Copyright © 2009-2013 by Fred George 13

Tasking Cycle
Task
Integrate Design
Simple
Design
Refactoring

Code Test
Copyright © 2009-2013 by Fred George 14

Refactoring
to Patterns
Joshua Kerievsky

Copyright © 2009-2013 by Fred George 15

Tasking Cycle
Task
Integrate Design
Introduce
Patterns
Refactoring Refactoring

Code Test
Copyright © 2009-2013 by Fred George 16

Case Study: Complexity

Cyclomatic Complexity
100 is Bad
“...never seen less than 5” - Senior Architect
Cyclomatic Complexity: 1.8
9 week test: 1 bug, ﬁxed within 2 hours

Copyright © 2009-2013 by Fred George 17

Path to Proﬁciency

en ce
xp eri
E

ng
i ni
Tra
ng
ki
or
W

Copyright © 2009-2013 by Fred George 18

Product Requests (London)
Payback: 28 Stories
11 Days 12 Days
Class
23 Stories 5 Days
15 Days

Copyright © 2009-2013 by Fred George 19

OO Boot Camp
“...teaches you to think like a programmer...”

Copyright © 2009-2013 by Fred George 20

“15 minutes after the class
started, I realized I knew
nothing about
programming.”
Lead Designer, Consulting Firm, commenting to
CIO of a large US manufacturer.

Copyright © 2009-2013 by Fred George 21

OO Boot Camp
History: Since 1995
Over 1000 Students; 3 countries
Java, VB, C#, Ruby
Socratic Method (Question - Answer - Question)
60%+ Lab
Pair Programming
Test First (15 Minute Cycle)
Students Present Solutions

Copyright © 2009-2013 by Fred George 22

Master

Journeyman

Apprentice

Copyright © 2009-2013 by Fred George 23

Master
2Y
ear
s-
Ne
ver
Journeyman

on ths
2- 6M

Apprentice
Copyright © 2009-2013 by Fred George 24

Part 1: Principles
Encapsulation Collaborating Objects
Object Relationships Interfaces
Inheritance Coding Patterns
Delegation Refactoring
Polymorphism Recursion

40-50 Hours
Copyright © 2009-2013 by Fred George 25

Part 2: Design Patterns
Rationale Composite Pattern
Patterns vs. Principles Visitor Pattern
Observer Pattern Builder Pattern
Iterator Pattern Concerts
Mediator Pattern Survey of Patterns

40-50 Hours
Copyright © 2009-2013 by Fred George 26

Suspicious Statements

case - Almost always wrong

else - Mostly wrong

if - Suspicious
Unless guard clause at start of method

Substitute Design Patterns for all these

Copyright © 2009-2013 by Fred George 27

Suspicious Methods

getters - Violates Encapsulation

setters - Worse: violates Encapsulation and Object
integrity
Methods with 2 or more levels of indenting

Copyright © 2009-2013 by Fred George 28

Suspicious Classes

Classes with names ending in -er or -or

Special naming conventions for Interfaces

Interface with a single implementing Class
Classes with more than 2 instance variables

Copyright © 2009-2013 by Fred George 29

Results
Dropouts 20%

Journeymen 20%
Architecture, Design, Multiple
Predictors Languages

Retention Must be used within a month

Support Journeymen, Masters

Copyright © 2009-2013 by Fred George 30

Maintenance
Old New

Java Java

Oracle DB Oracle DB

Web UI Web UI

72 Classes 1400 Classes

Copyright © 2009-2013 by Fred George 31

Transition Plan

No Documentation
No Training
No Time
No Problem!

Copyright © 2009-2013 by Fred George 32

Training -- OO Boot Camp
First class 1 October
9-12 students / class
Include project managers and QA
4 classes so far

Copyright © 2009-2013 by Fred George 33

Implementation
Start development on 15 October
Ruby used (never used before 1 October)
No stories - just business problem
First page ready for review by end of November

Copyright © 2009-2013 by Fred George 34

Currently...
5 Tables running
Each Table has it’s own business problem
Only developers
Speaker designated
Processes are varying, particularly metrics

Copyright © 2009-2013 by Fred George 35

Questions?

Copyright © 2009-2013 by Fred George 36

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16. Case Study: Complexity Cyclomatic Complexity 100 is Bad “...never seen less than 5” - Senior Architect Cyclomatic Complexity: 1.8 9 week test: 1 bug, ﬁxed within 2 hours Copyright © 2009-2013 by Fred George 17

20. “15 minutes after the class started, I realized I knew nothing about programming.” Lead Designer, Consulting Firm, commenting to CIO of a large US manufacturer. Copyright © 2009-2013 by Fred George 21

21. OO Boot Camp History: Since 1995 Over 1000 Students; 3 countries Java, VB, C#, Ruby Socratic Method (Question - Answer - Question) 60%+ Lab Pair Programming Test First (15 Minute Cycle) Students Present Solutions Copyright © 2009-2013 by Fred George 22

24. Part 1: Principles Encapsulation Collaborating Objects Object Relationships Interfaces Inheritance Coding Patterns Delegation Refactoring Polymorphism Recursion 40-50 Hours Copyright © 2009-2013 by Fred George 25

25. Part 2: Design Patterns Rationale Composite Pattern Patterns vs. Principles Visitor Pattern Observer Pattern Builder Pattern Iterator Pattern Concerts Mediator Pattern Survey of Patterns 40-50 Hours Copyright © 2009-2013 by Fred George 26

26. Suspicious Statements case - Almost always wrong else - Mostly wrong if - Suspicious Unless guard clause at start of method Substitute Design Patterns for all these Copyright © 2009-2013 by Fred George 27

28. Suspicious Classes Classes with names ending in -er or -or Special naming conventions for Interfaces Interface with a single implementing Class Classes with more than 2 instance variables Copyright © 2009-2013 by Fred George 29

33. Implementation Start development on 15 October Ruby used (never used before 1 October) No stories - just business problem First page ready for review by end of November Copyright © 2009-2013 by Fred George 34

Secret Assumption of Agile

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