Is Software Evolution Really Effective

Anti-IF Campaign:
Is Software Evolution
really eﬀective?
XPDays Germany 2011
Karlsruhe 17.11.2011

Francesco Cirillo • Director, Anti-IF School
francesco@antiifschool.com • @antiifschool

About me

Francesco Cirillo • Director, Anti-IF School XPDays Germany
francesco@antiifschool.com • @antiifschool Karlsruhe, 17.11.2011

The Anti-IF Campaign

Kent Beck Craig Larman

http://www.antiifcampaign.com/join-the-campaign.html


Code Monsters
McCabe Index = 300


Is Software Evolution Really Eﬀective?

What does software evolution really mean?

How much should eﬀective software evolution cost?


Software Development


Software Engineering

da
“Evolutionary
Biology”
Douglas J. Futuyama
1998, pag 653


Evolution
“In biology the term evolution
means the gradual and continuous
accumulation of modifications
over a sufficiently long period of
time in which significant changes
manifest in living organisms”.

Source Wikipedia


Evolutionary process
“It is not the strongest
of the species that survives,
nor the most intelligent
that survives.
It is the one that is the most
adaptable to change.”
Charles Darwin


What is your strategy?


100% Flexible...

IF-based evolution strategy


Emergent


What kind of TDD do you do?
Copyright 200-2006
Scott. W. Ambler

Add a test

[Pass]
Run the tests

Make a little change [Pass,
Development
[Fail] continues]
Run the tests

[Pass, Development stops]


What is the most eﬀective TDD?


Evolution & Emergent
• These words tell us nothing about what should be
done and what should not be done.
• They don’t give you a test as to when to do something
or how to do it.
• They don’t say anything about how that continuous
accumulation of modi cations should happen.

• They just say that your software can be called
evolutionary because it derives from a continuous
accumulation of modi cations.


Is Software Evolution Really Eﬀective?

What does software evolution really mean?
mean

How much should eﬀective software evolution cost?


Earnings
ROI =
Costs


A good startup should not only
generate income but also have a
team capable of wisely reducing
its costs.


How much does it cost?

How much does eﬀective Software
Evolution cost?


What about adding similar features
Costs

Time
Mature Team’s Evolutionary Marginal Cost For Similar Features


Is this what really happens?

Not at all!


Pomodoro Apps


Requirements Pomodoro 1.0

Show a
Pomodoro
background

Set the timer by
pressing a button

Ring after
Total cost:
10.000 €
25 minutes


Lesson #1
Software Evolution costs too much

Francesco: “Would you buy your own software?”

App’s Developer: “NO!”


Is Software Evolution
cost eﬀective?

NO!


Too costly


Lesson #2
Mature teams cost more
Recently formed team
Mature team


Are you really improving your process
or feeding your Code Monster?
Quality Eﬀectiveness of Investment
in Process Improvement

Time
Perceived internal quality of software
Eﬀort spent on Process Improvement


Would you buy your own software?

Software can be built in an evolutionary way.

Evolutionary development costs too much.

We are not conscious enough of the strategies.


Do you want to be involved?
Would you buy your own software?

What does the term evolution mean to your team?

Would a team less “mature” than yours have lower costs?
Consider you have to introduce a second feature that is similar
to something you’ve already done. Does it cost less than the
rst time you did it? Why?

http://www.antiifcampaign.com/2011/11/would-you-buy-your-own-software.html


Thanks for listening.

Questions?


Is Software Evolution Really Effective

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