SlideShare a Scribd company logo
INCREASE QUALITY,
SAVE MONEY
@DTANZER
BUSINESS@DAVIDTANZER.NET
1 SCRUM TEAM
1 000 000 EUROS / YEAR
...approximately
SHIPPING FASTER
Cycle Time
Lead Time
SPEED AND COST
SPEED AND SCOPE
Requirements are usually incomplete and
change at rates in excess of 2% per
calendar month.
-- Capers Jones (2013)
QUALITY
Internal Quality
External Quality
Defects (a.k.a Bugs)
THE COST OF A DEFECT
Fixing the Defect
Testing
Preparing Hotfix
Deployment
Lost Productivity (Users)
Lost Credibility
Opportunity Cost
...
THE COST OF A DEFECT
...OVER TIME
A defect found in the specification...
INTERNAL QUALITY
DESIGN / ARCHITECTURE
THE COST OF A FEATURE
...OVER TIME
SIDE EFFECTS
DUPLICATION
FINDING THE PLACES FOR CHANGES
ADDING CODE VS. CHANGING CODE
REWORK /
"PRODUCTIVE" WORK
NON-PRODUCTIVE WORK
Meetings
Office work (Emails, Time Sheets, ...)
Fixing defects
Changed requirements
Searching where to change
Manual testing
Other manual steps
...
REMEMBER...
THE COST OF A FEATURE
...OVER TIME
% NON-PRODUCTIVE
WORK?
FEEDBACK CYCLES
HOW DO I KNOW I DID THE RIGHT THING?
WHEN DO I KNOW IT?
WHAT IF WE HAD TO RELEASE...
Every Month?
Every Week?
Every Day?
Every Commit?
REMEMBER...
SPEED AND COST
SPEED AND SCOPE
AVOID MANUAL STEPS
Testing
Build
Statistics
Deployment
Provisioning
...
FASTER FEEDBACK IS BETTER!
QUALITY IS FREE
Investments in Quality (usually) pay for themselves...
1 SCRUM TEAM
1 000 000 EUROS / YEAR
...approximately
TEAM
Hours per month: 1 500
Internal rate: 70 / Hour
Cost per month: 105 000
Value created per month: 131 250
TEAM
Value created per month: 131 250
"Productive" time: 50%
Value created per productive hour: 175
INVESTMENT IN QUALITY
Hours: 150 / Month
Money: 5250 / Month
Sustainable reduction of non-productive time:
1% per Month
 
 
MORE REALISTICALLY:
If you do not invest in quality, productivity declines.
e.g. 0.25% worsening per month
 
SOLUTIONS
A.K.A. "SILVER BULLETS"
THERE IS NO SILVER BULLET...
BUT:
Many small, sustainable improvements will yield big returns
over time.
TDD
ATDD
AGILE ACCEPTANCE
TESTING
SPECIFICATION BY
EXAMPLE
CONTINUOUS
IMPROVEMENT
DO YOUR RETROSPECTIVES YIELD
RESULTS?
HOW CAN YOU MAKE SURE?
SHORTER FEEDBACK
CYCLES
DEVELOPMENT
TESTING
DELIVERY
DEPLOYMENT
DELIBERATE
ARCHITECTURE AND
DESIGN
BY THE WHOLE TEAM!
MODERN
ARCHITECTURES (?)
REST
MICROSERVICES
DELIBERATE
ARCHITECTURE AND
DESIGN
BY THE WHOLE TEAM!
AUTOMATE
EVERYTHING!
@DTANZER
BUSINESS@DAVIDTANZER.NET
USEFUL LINKS
CODE COMPLETE - STEVE
MCCONNELL
http://www.amazon.de/Code-Complete-Practical-
Construction-Costruction/dp/0735619670
THE MYTHICAL MAN-MONTH. ESSAYS
ON SOFTWARE ENGINEERING
http://www.amazon.de/Mythical-Man-Month-Essays-
So ware-Engineering/dp/0201835959
WELL CRAFTED CODE, QUALITY,
SPEED AND BUDGET
http://devteams.at/well_cra ed_code_quality_speed_budget
TECHNICAL DEPT
https://www.youtube.com/watch?v=pqeJFYwnkjE
COMPLEXITY /
COMPLICATION
https://vimeo.com/79106557
UNDERSTANDING REQUIREMENTS
http://www.amazon.de/Impact-Mapping-So ware-
Products-Projects/dp/0955683645
http://www.amazon.de/Bridging-Communication-Gap-
Specification-Acceptance-ebook/dp/B008YZ993W

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