The document discusses the principles of test-driven design and lean UX. It outlines 9 lean UX principles including having a unified product team, externalizing work, being goal-driven, and conducting rapid cycles of building, testing, and learning from user research. The document advocates for declaring assumptions as hypotheses to test, writing tests before building products, creating minimum viable products to test assumptions quickly and cheaply, and getting out of the building to directly validate assumptions with users.

1. TEST-DRIVEN DESIGN
Balanced Team Conference
September 25, 2011
Josh Seiden, @jseiden

2. Blog it!
Josh Seiden @jseiden #leanUX
www.luxr.co @luxrco #leanStartup
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3. 9 Lean UX Principles
1. Design + biz + development + ... = 1 product team.
2. Externalize!
3. Goal-driven and outcome-focused.
4. Repeatable and routinized.
5. Flow: think, make, check.
6. Focus on solving the right problem.
7. Generate many options & decide quickly what to pursue
8. Recognize hypotheses & validate them
9. Rapid cycles: think/make/check Research with users is
the best source of information
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4. 9 Lean UX Principles
1. Design + biz + development + ... = 1 product team.
2. Externalize!
3. Goal-driven and outcome-focused.
4. Repeatable and routinized.
5. Flow: think, make, check.
6. Focus on solving the right problem.
7. Generate many options & decide quickly what to pursue
8. Recognize hypotheses & validate them
9. Rapid cycles: think/make/check Research with users is
the best source of information
www.luxr.co License: Creative Commons Attribution-
www.slideshare.net/jseiden 3 Share Alike 3.0 United States

5. 9 Lean UX Principles
1. Design + biz + development + ... = 1 product team.
2. Externalize!
3. Goal-driven and outcome-focused.
4. Repeatable and routinized.
5. Flow: think, make, check.
6. Focus on solving the right problem.
7. Generate many options & decide quickly what to pursue
8. Recognize hypotheses & validate them
9. Rapid cycles: think/make/check Research with users is
the best source of information
www.luxr.co License: Creative Commons Attribution-
www.slideshare.net/jseiden 3 Share Alike 3.0 United States

6. Principle #8 Declare your assumptions...
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7. Principle #8 Declare your assumptions...
A way to re-frame requirements
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8. Principle #8 Declare your assumptions...
A way to re-frame requirements
 Every decision you make about your offering is a
design decision.
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9. Principle #8 Declare your assumptions...
A way to re-frame requirements
 Every decision you make about your offering is a
design decision.
 Every design decision is an hypothesis.
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10. Principle #8 Declare your assumptions...
A way to re-frame requirements
 Every decision you make about your offering is a
design decision.
 Every design decision is an hypothesis.
 Declare your assumptions and test them.
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15. 7

16. Internet Mouse…
www.luxr.co
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? 8
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17. Internet Mouse…
www.luxr.co
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? 8
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18. Internet Mouse…
www.luxr.co
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?!
8
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19. Method: Declare your assumptions
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20. Method: Declare your assumptions
What assumptions do you have?
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21. Method: Declare your assumptions
What assumptions do you have?
…about your customers?
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22. Method: Declare your assumptions
What assumptions do you have?
…about your customers?
…that if proven false, will cause you to fail?
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23. What assumptions are we making?
 Who is the user? Who is the customer?
 Where does our product fit in their work or life?
 What problems does our product solve?
 When and how is our product used?
 What features are important?
 How should our product look and behave?
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24. Method: Write the test first
We believe that person type has trouble/need/desire doing
problem/oppty. [that can be addressed by our offering.]
We will know we have succeeded when qualitative and
quantitative outcome. This will improve KPI.
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25. Method: Minimum Viable Product
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26. Method: Minimum Viable Product
What is the smallest thing we can make to test
our hypothesis?
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27. Method: Minimum Viable Product
What is the smallest thing we can make to test
our hypothesis?
The answer to this question is your MVP.
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28. Method: Get out of the building
 Identify who do you want to talk to and what you
want to learn
In other words, what assumptions will you test?
Stay tuned for Lane’s talk...
 Plan your interview themes as a team
 Collect artifacts, debrief and share
 Use your visits for multiple purposes
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29. Want to attend a workshop? Tweet #LUXiNYC to @LUXrCo
THANK YOU!
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