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!


Build It Right!

Ship It Fast!


Build It Right!

Ship It Fast!

What Is Best?


Dirty Clean

Fast

SlowThursday, December 16, 2010

Dirty Clean

Fast

Slow

DEFECT


Low High

Value

Low High

Demand

Slow Fast

Delivery


Complex Simple

Design

Low High

Debt

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


Low

Value

Low

Demand

Slow

Delivery

High

High

Fast


Complex Simple

Design

Low High

Debt

Assembled Crafted

Development


Low High

Value

Low High

Demand

Slow Fast

Delivery


Complex Simple

Design

Low High

Debt

Assembled Crafted

Development


Quick Collaborationon the Web


Low High

Value

Low High

Demand

Slow Fast

Delivery


Complex Simple

Design

Low High

Debt

Assembled Crafted

Development


Low High

Value

Low High

Demand

Slow Fast

Delivery


Complex Simple

Design

Low High

Debt

Assembled Crafted

Development


Low High

Value

Low High

Demand

Slow Fast

Delivery


Complex Simple

Design

Low High

Debt

Assembled Crafted

Development


Low High

Value

Low High

Demand

Slow

Delivery

Fast


Simple

Design

Low High

Debt

Assembled Crafted

Development

Complex


Sketch


Sketch

Craft


Sketch

Craft

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)


http://www.satisfice.com/articles/gooden2.pdf




http://www.satisfice.com/articles/good_enough_quality.pdf




http://www.startuplessonslearned.com/2010/09/good-enough-never-is-or-is-it.html




Sufficient Design

Technology

Transcript of Sufficient Design