sufficient design

Sufficient Design

December 2010Joshua Kerievsky

Industrial Logic, Inc.Twitter: @JoshuaKerievsky

#SufficientDesign

Thursday, December 16, 2010

ThereIFixedIt.comThursday, December 16, 2010

What Is

Sufficient Design?

Build It Right!

Ship It Fast!

Build It Right!

Ship It Fast!

What Is Best?

Dirty Clean

SlowThursday, December 16, 2010

Dirty Clean

DEFECT

Low High

Demand

Slow Fast

Delivery

Complex Simple

Design

Low High

Assembled Crafted

Development

5.X Development Deathcycle

1.0 Release

2.0 Release

3.0 Release

4.0 Release

5.0 Release

Costof

Change(CoC)

1 2 3 4 5Years

Release

Actual CoC

Optimal CoC

Model courtesy of Jim HighsmithThursday, December 16, 2010

Costof

Change(CoC)

1 2 3 4 5Years

Release

Actual CoC

Technical Debt

Optimal CoC

Costof

Change(CoC)

1 2 3 4 5Years

Release

Actual CoC

Technical Debt

Optimal CoC

CustomerResponsiveness

Sufficient DesignCase Studies

Manufacture In Bulk At Low Cost

Deliver At No Cost To Least Served

Goal: Quickly DeliverTo 20 Million People

CheapPatio

Furniture

Tough,DurableBike Tire

ToughCheap

Castors

Steel FrameCheaply

Produced

SimpleParts +

Assembly

$59.20Competitor? $150

CheapPatio

Furniture

Tough,DurableBike Tire

ToughCheap

Castors

Steel FrameCheaply

Produced

SimpleParts +

Assembly

$59.20Competitor? $150

Demand

Delivery

Complex Simple

Design

Low High

Assembled Crafted

Development

Low High

Demand

Slow Fast

Delivery

Complex Simple

Design

Low High

Assembled Crafted

Development

Quick Collaborationon the Web

Low High

Demand

Slow Fast

Delivery

Complex Simple

Design

Low High

Assembled Crafted

Development

Low High

Demand

Slow Fast

Delivery

Complex Simple

Design

Low High

Assembled Crafted

Development

Low High

Demand

Slow Fast

Delivery

Complex Simple

Design

Low High

Assembled Crafted

Development

Low High

Demand

Delivery

Simple

Design

Low High

Assembled Crafted

Development

Complex

Sketch

RefineThursday, December 16, 2010

Fowler’s Design Payoff Line

“Good Enough” involves rational choices, not compulsive behavior.

-James Bach, Good Enough Quality

Sufficient Design may be Excellent to Poor design based on the CONTEXT at hand.

Good Enough has nothing to do

with mediocrity. -James Bach,

Good Enough Quality

“Our goal is to achieve an acceptable level

of risk.”-James Bach,

The Challenge of “Good Enough” Software

“Learn One New

Programming Language

Every Year.”

“Learn One New

Programming Language

Every OTHERYear.”

Thank You!

Bibliography

• The Challenge of Good Enough Software, James Bach (www.satisfice.com/articles/gooden2.pdf)

• Good Enough Quality, James Bach (www.satisfice.com/articles/good_enough_quality.pdf)

• Good Enough Never Is (Or Is It?), Eric Ries (http://www.startuplessonslearned.com/2010/09/good-enough-never-is-or-is-it.html)

sufficient design

fast dirty cleanslowthursday

poor design

whatissufcient design

furniturebike tire castors

james bach

rational choices

low costthursday

compulsive behavior

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