Working with Legacy Teams

Jens Schauder @jensschauder

T-Systems on site services GmbH

Come along

Brownfield Projekt

WTF?

Aufmunitionieren

Checkstyle + Jenkins

I See Dead Code!

Magic Numbers

firstName = rs.getString(1)

Magic Numbers

firstName = rs.getString(1)

lastName = rs.getString(2)

Magic Numbers

firstName = rs.getString(1)

lastName = rs.getString(2)

age = rs.getInt(2+1)

Magic Numbers

firstName = rs.getString(1)

lastName = rs.getString(2)

age = rs.getInt(2+1)

city = rs.getString(2+2)

Magic Numbers

firstName = rs.getString(1)

lastName = rs.getString(2)

age = rs.getInt(2+1)

city = rs.getString(2+2)

zip = rs.getString(2+2+1)

Change The World!

Den Mund zu Voll Genommen

Wie konnte das passieren?

Conways Law

"organizations which design systems ...

are constrained to produce designs

which are copies of the communication

structures of these organizations"

Schauders Corollary

"If your team is a mess, so will be your

code."

Jim McCarthy

“You can’t have great software without a

great team, and most software teams

behave like dysfunctional families.”

Legacy Teams

BJ Fogg‘s Behaviour Model

SCARF

SCARF

Metriken Reloaded

Metriken sind Leitplanken

Change the World Reloaded

Broken Window Theorie

Mikado Methode

Quarantäne

If it hurts, do it more often

Vorsicht Cargo Kult

Teammitgliedversteher

Teambuilding

References

• http://www.behaviormodel.org/

• http://www.davidrock.net/files/NLJ_SCA

RFUS.pdf

• http://mikadomethod.org/

Images

• Monty Pythons French Waiter

http://www.youtube.com/watch?v=mzlCdWwYn2I

• WTF per minute http://xkcd.com/

• Matrix der Film

• Sixths Sense

• Engraving from Mechanic’s Magazine (cover of bound Volume

II, Knight & Lacey, London, 1824). Courtesy of the Annenberg

Rare Book & Manuscript Library, University of Pennsylvania,

Philadelphia, USA.

• Colorful Floral Abstract

http://www.sxc.hu/photo/1271814http://www.sxc.hu/photo/12718

14

More Images

• Preacher Until: The End Of The World

• Matrix Reloaded

• Schutzplanke

http://commons.wikimedia.org/wiki/File:Bauteile_Schutzplanke.p

ng

• Long Walk

http://www.flickr.com/photos/143andy/2433641086/in/photostrea

m/

• window with a view of ruined buildings

http://www.sxc.hu/photo/1413673

• Mikado http://www.flickr.com/photos/mordicuac/116695148/

Even More Images

• Fantastic Four http://en.wikipedia.org/wiki/File:FF509.jpg

• Ouch

http://en.wikipedia.org/wiki/File:OuchFlintGoodrichShot1941.jpg

• Coned ice cream http://www.sxc.hu/photo/1127245

• Dentist http://www.sxc.hu/photo/33199

• Malton Department of Defense/Quarantine Poster

http://wiki.urbandead.com/index.php/Malton_Department_of_De

fense/Quarantine_Poster

• The Fantastic Four; Marvel Comics

Working with Legacy Teams

Jens Schauder @jensschauder

T-Systems on site services GmbH