What is Software Architecture... and an overview.
PV260 Software Quality
Ondřej "Ondra" Krajíček HgjíE ondrej.krajicek@ysoft.com [ffi ©OndrejKrajicek H
"Perfection is not achieved when there is nothing to add, but
when there is nothing to remove."
Antoine de Saint Exupery
"Insanity is doing the same thing over and over and expecting
different results."
(attributed to) Albert Einstein
"It has to work."
IETF RFC 1925
Software Architecture is seldom about functional requirements.
Software Architecture is the important stuff
(whatever that is).
Ralph Johnson
Cost
Cost
Programming defect found via Pair Programming
Programming defect found via Continuous Integration
Requirements defect found via traditional acceptance testing
Design defect found via traditional system testing
Design or programming defect found via Test Driven Development (TDD)
Requirements or design defect found via Active Stakeholder Participation
Requirements or design defect found via Model Storming
Progamming defect found via traditional " system testing
Defect found via a review or inspection
_____Defect found via independent
parallel testing
Time
Length of Feedback Cycle
Copyright 2006-2009 Scon W. Ambl&r
COSt Of Change Curve       Copyright (c) 2006-2009 Scott W Ambler
SOFTWARE ARCHITECTURE IS THE SERVANT OF HIGH-PRIORITY STAKEHOLDER VALUES.
IS AS SIMPLE AS POSSIBLE, BUT NOT SIMPLER AND IS DESIGNED TO BE REPLACEABLE.
Tom Gilb (Architecture Manifesto)
COMPETITIVE
ENGINEERING
A HAMMOOR* KM SYS TIMS ENGINEERING. REQUIREMENTS ENGINEERING. ANO SOFTWARE ENGINEERING USING ^LANGUAGE
SERVANT HIGH-PRIORITY STAKEHOLDER VALUES AS SIMPLE AS POSSIBLE NOT SIMPLER REPLACEABLE
Software Architecture is Strategy
Strategy is a plan how to deliver on your goals. Your goals are defined by high-priority stakeholders.
SOFTWARE ARCHITECTURE IS THE STRATEGY HOW TO DELIVER HIGH-PRIORITY STAKEHOLDER VALUES.
It is still important to accept change because no battle plan survives the first contact with the enemy.
Software Architecture is Risk Mitigation
What happens when things go wrong? Is it important?
Software Architecture is Communication
What does it mean? How to deliver and protect stakeholder values?
Software Architect is a Teacher
HOW ARE YOU DOING ON YOUR UNSPOKEN OBJECTIVES?
rAY WHAT?
as
I'M REFERRING TO THE GOALS I HAVE IN NY KIND THAT I'VE NEVER MENTIONED.
HOW
ARE THOSE GOING?
TOTALLY NAILING THEN.
Who does software architecture then?
Software Architecture is done by everyone.
Key Takeaways
Architecture is a servant of high priority stakeholder values, Is as simple as possible, but not simpler. Is designed to be replaceable.
Software Architecture is a Strategy. Software Architecture is Communication Software Architect is a Teacher.