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