20111117 Is Software Evolution really effective? @XPDayGE2011 Karlsruhe-GE [ENG]

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Francesco Cirillo gave a presentation questioning whether software evolution is truly effective and cost efficient. He argued that software evolution costs too much, and that mature development teams tend to cost more than newer, less experienced teams. He also questioned whether teams are actually improving their processes over time or just feeding increasingly complex "Code Monsters". Overall, the presentation raised doubts about common assumptions around software evolution and advocated for more conscious strategies.

Technology Education

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

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

Code Monsters
McCabe Index = 300

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

Is Software Evolution Really Eﬀective?

What does software evolution really mean?

How much should eﬀective software evolution cost?

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

Software Development

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

Software Engineering

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

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

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

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

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

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

What is your strategy?

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

100% Flexible...
Francesco Cirillo • Director, Anti-IF School XPDays Germany
francesco@antiifschool.com • @antiifschool Karlsruhe, 17.11.2011

IF-based evolution strategy

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

Emergent

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

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]

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

What is the most eﬀective TDD?

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

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.

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

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

Is Software Evolution Really Eﬀective?

What does software evolution really mean?
mean

How much should eﬀective software evolution cost?

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

Earnings
ROI =
Costs

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

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

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

How much does it cost?
Francesco Cirillo • Director, Anti-IF School XPDays Germany
francesco@antiifschool.com • @antiifschool Karlsruhe, 17.11.2011

How much does eﬀective Software
Evolution cost?

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

What about adding similar features
Costs

Time
Mature Team’s Evolutionary Marginal Cost For Similar Features

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

Is this what really happens?

Not at all!

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

Pomodoro Apps

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

Requirements Pomodoro 1.0

Show a
Pomodoro
background

Set the timer by
pressing a button

Ring after
Total cost:
10.000 €
25 minutes

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

Lesson #1
Software Evolution costs too much

Francesco: “Would you buy your own software?”

App’s Developer: “NO!”

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

Is Software Evolution
cost eﬀective?

NO!

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

Too costly

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

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

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

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

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

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.

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

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

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

Thanks for listening.

Questions?

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

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20111117 Is Software Evolution really effective? @XPDayGE2011 Karlsruhe-GE [ENG]

1. 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

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

3. The Anti-IF Campaign Kent Beck Craig Larman http://www.antiifcampaign.com/join-the-campaign.html Francesco Cirillo • Director, Anti-IF School XPDays Germany francesco@antiifschool.com • @antiifschool Karlsruhe, 17.11.2011

4. Code Monsters McCabe Index = 300 Francesco Cirillo • Director, Anti-IF School XPDays Germany francesco@antiifschool.com • @antiifschool Karlsruhe, 17.11.2011

5. Code Monsters McCabe Index = 300 Francesco Cirillo • Director, Anti-IF School XPDays Germany francesco@antiifschool.com • @antiifschool Karlsruhe, 17.11.2011

6. Code Monsters McCabe Index = 300 Francesco Cirillo • Director, Anti-IF School XPDays Germany francesco@antiifschool.com • @antiifschool Karlsruhe, 17.11.2011

7. Is Software Evolution Really Eﬀective? What does software evolution really mean? How much should eﬀective software evolution cost? Francesco Cirillo • Director, Anti-IF School XPDays Germany francesco@antiifschool.com • @antiifschool Karlsruhe, 17.11.2011

8. Is Software Evolution Really Eﬀective? What does software evolution really mean? How much should eﬀective software evolution cost? Francesco Cirillo • Director, Anti-IF School XPDays Germany francesco@antiifschool.com • @antiifschool Karlsruhe, 17.11.2011

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

10. Software Engineering da “Evolutionary Biology” Douglas J. Futuyama 1998, pag 653 Francesco Cirillo • Director, Anti-IF School XPDays Germany francesco@antiifschool.com • @antiifschool Karlsruhe, 17.11.2011

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

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

13. What is your strategy? Francesco Cirillo • Director, Anti-IF School XPDays Germany francesco@antiifschool.com • @antiifschool Karlsruhe, 17.11.2011

14. 100% Flexible... Francesco Cirillo • Director, Anti-IF School XPDays Germany francesco@antiifschool.com • @antiifschool Karlsruhe, 17.11.2011

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

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

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

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

19. What is the most eﬀective TDD? Francesco Cirillo • Director, Anti-IF School XPDays Germany francesco@antiifschool.com • @antiifschool Karlsruhe, 17.11.2011

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

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

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

23. Is Software Evolution Really Eﬀective? What does software evolution really mean? mean How much should eﬀective software evolution cost? Francesco Cirillo • Director, Anti-IF School XPDays Germany francesco@antiifschool.com • @antiifschool Karlsruhe, 17.11.2011

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

25. Earnings ROI = Costs Francesco Cirillo • Director, Anti-IF School XPDays Germany francesco@antiifschool.com • @antiifschool Karlsruhe, 17.11.2011

26. A good startup should not only generate income but also have a team capable of wisely reducing its costs. Francesco Cirillo • Director, Anti-IF School XPDays Germany francesco@antiifschool.com • @antiifschool Karlsruhe, 17.11.2011

27. How much does it cost? Francesco Cirillo • Director, Anti-IF School XPDays Germany francesco@antiifschool.com • @antiifschool Karlsruhe, 17.11.2011

28. How much does eﬀective Software Evolution cost? Francesco Cirillo • Director, Anti-IF School XPDays Germany francesco@antiifschool.com • @antiifschool Karlsruhe, 17.11.2011

29. What about adding similar features Costs Time Mature Team’s Evolutionary Marginal Cost For Similar Features Francesco Cirillo • Director, Anti-IF School XPDays Germany francesco@antiifschool.com • @antiifschool Karlsruhe, 17.11.2011

30. Is this what really happens? Not at all! Francesco Cirillo • Director, Anti-IF School XPDays Germany francesco@antiifschool.com • @antiifschool Karlsruhe, 17.11.2011

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

32. Requirements Pomodoro 1.0 Show a Pomodoro background Set the timer by pressing a button Ring after Total cost: 10.000 € 25 minutes Francesco Cirillo • Director, Anti-IF School XPDays Germany francesco@antiifschool.com • @antiifschool Karlsruhe, 17.11.2011

33. Lesson #1 Software Evolution costs too much Francesco: “Would you buy your own software?” App’s Developer: “NO!” Francesco Cirillo • Director, Anti-IF School XPDays Germany francesco@antiifschool.com • @antiifschool Karlsruhe, 17.11.2011

34. Is Software Evolution cost eﬀective? NO! Francesco Cirillo • Director, Anti-IF School XPDays Germany francesco@antiifschool.com • @antiifschool Karlsruhe, 17.11.2011

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

36. Lesson #2 Mature teams cost more Recently formed team Mature team Francesco Cirillo • Director, Anti-IF School XPDays Germany francesco@antiifschool.com • @antiifschool Karlsruhe, 17.11.2011

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

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

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

40. Thanks for listening. Questions? Francesco Cirillo • Director, Anti-IF School XPDays Germany francesco@antiifschool.com • @antiifschool Karlsruhe, 17.11.2011

20111117 Is Software Evolution really effective? @XPDayGE2011 Karlsruhe-GE [ENG]

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