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Cognitive 
Biases
Stay out of Design 
and Research!
Jen Blatz
 UX Researcher & Designer
 @jnblatz
 @jnblatz
Cognitive Bias
 @jnblatz
 jenniferblatz
Cognitive Bias
 @jnblatz
 jenniferblatz
Cognitive Bias
 @jnblatz
 jenniferblatz
Cognitive Bias
 Pareidolia 
Pareidolia
@jnblatz
 jenniferblatz
Cognitive Bias
 Jen Blatz
Jen Blatz
UX Researcher & Designer
@jnblatz
 jenniferblatz
Cognitive Bias
 Jen Blatz
Local UX groups leader
@jnblatz
 jenniferblatz
www.uxresearchandstrategy.com
Cognitive Bias
Not a psychologist
@jnblatz
 jenniferblatz
Cognitive Bias
 Agenda
Agenda
• Define cognitive bias
• Signs in yourself & others
• What you can do to fight them off 
• Use them for good! 
@jnblatz
 jenniferblatz
Cognitive Bias
 Definition
Definition
A cognitive bias is a systematic pattern of
deviation from norm or rationality in judgment. 
@jnblatz
 jenniferblatz
Cognitive Bias
 Importance
@jnblatz
 jenniferblatz
Cognitive Bias
 Self/You
Self
@jnblatz
 jenniferblatz
Cognitive Bias
 Blind Spot Bias
Blind Spot Bias
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 jenniferblatz
Cognitive Bias
 Blind Spot Bias
@jnblatz
 jenniferblatz
Cognitive Bias
 Experimenter's Bias
Experimenter's Bias
@jnblatz
 jenniferblatz
Cognitive Bias
 Experimenter's Bias
Story time
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 jenniferblatz
Cognitive Bias
 Observer-Expectancy Effect
Observer-Expectancy Effect 
@jnblatz
 jenniferblatz
Cognitive Bias
 Observer-Expectancy Effect
@jnblatz
 jenniferblatz
Cognitive Bias
 Observer-Expectancy Effect
Story time
@jnblatz
 jenniferblatz
Cognitive Bias
 Observer-Expectancy Effect
@jnblatz
 jenniferblatz
Cognitive Bias
 Observer-Expectancy Effect
@jnblatz
 jenniferblatz
Cognitive Bias
 Self vs. Others
Self vs. Others
@jnblatz
 jenniferblatz
Cognitive Bias
 Social Comparison Bias
Social Comparison Bias
@jnblatz
 jenniferblatz
Cognitive Bias
 Social Comparison Bias
@jnblatz
 jenniferblatz
Cognitive Bias
 Align with me, my Beliefs
Align with self
@jnblatz
 jenniferblatz
Cognitive Bias
 Semmelweis Effect
Semmelweis Effect
@jnblatz
 jenniferblatz
Cognitive Bias
 Semmelweis Effect
@jnblatz
 jenniferblatz
Cognitive Bias
 Semmelweis Effect
@jnblatz
 jenniferblatz
Cognitive Bias
 Semmelweis Effect
@jnblatz
 jenniferblatz
Cognitive Bias
 Semmelweis Effect
@jnblatz
 jenniferblatz
Cognitive Bias
 Not Invented Here Bias
Not Invented Here Bias
@jnblatz
 jenniferblatz
Cognitive Bias
 Not Invented Here Bias
Not invented here 
• Job security
• Fear
• Jealous
• Turf war
@jnblatz
 jenniferblatz
Cognitive Bias
 Social Conformation
Social Conformity
@jnblatz
 jenniferblatz
Cognitive Bias
 Courtesy Bias
Courtesy Bias
@jnblatz
 jenniferblatz
Cognitive Bias
 Courtesy Bias
@jnblatz
 jenniferblatz
Cognitive Bias
 Courtesy Bias
@jnblatz
 jenniferblatz
Cognitive Bias
 Courtesy Bias
Brainstorming
1. Write ideas down silently
2. Put post it notes on the wall silently 
3. Discuss ideas together, as a group
@jnblatz
 jenniferblatz
Cognitive Bias
 @jnblatz
 jenniferblatz
Cognitive Bias
 @jnblatz
 jenniferblatz
Cognitive Bias
 Recent vs. Long Ago
Recent vs. long ago
@jnblatz
 jenniferblatz
Cognitive Bias
 Baader-Meinhoff and Frequency Illusion 
Baader-Meinhof Effect
@jnblatz
 jenniferblatz
Cognitive Bias
 Baader-Meinhoff and Frequency Illusion 
@jnblatz
 jenniferblatz
Cognitive Bias
 Baader-Meinhoff and Frequency Illusion 
@jnblatz
 jenniferblatz
Cognitive Bias
 Baader-Meinhoff and Frequency Illusion 
@jnblatz
 jenniferblatz
Cognitive Bias
 Peak-End Rule
Peak-End Rule
@jnblatz
 jenniferblatz
Cognitive Bias
 Peak-End Rule
Story time
@jnblatz
 jenniferblatz
Cognitive Bias
 Peak-End Rule
Ethnographic Observation
@jnblatz
 jenniferblatz
Cognitive Bias
 For Good in Design
For good
@jnblatz
 jenniferblatz
Cognitive Bias
 Baader-Meinhoff and Frequency Illusion 
Baader-Meinhof Effect
@jnblatz
 jenniferblatz
Cognitive Bias
 IKEA Effect
@jnblatz
 jenniferblatz
Cognitive Bias
 IKEA Effect
Ikea Effect
@jnblatz
 jenniferblatz
Cognitive Bias
 IKEA Effect
@jnblatz
 jenniferblatz
Cognitive Bias
 Humor Effect
Humor Effect
@jnblatz
 jenniferblatz
Cognitive Bias
 Humor Effect
@jnblatz
 jenniferblatz
Cognitive Bias
 Humor Effect
@jnblatz
 jenniferblatz
Cognitive Bias
 Bizarre Effect
Bizarre Effect
@jnblatz
 jenniferblatz
Cognitive Bias
 Bizarre Effect
@jnblatz
 jenniferblatz
Cognitive Bias
 Bizarre Effect
@jnblatz
 jenniferblatz
Cognitive Bias
 Bizarre Effect
@jnblatz
 jenniferblatz
Cognitive Bias
 Default Effect
Messy room
before
@jnblatz
 jenniferblatz
Cognitive Bias
 Default Effect
@jnblatz
 jenniferblatz
Cognitive Bias
 Default Effect
Default Effect
@jnblatz
 jenniferblatz
Cognitive Bias
 Default Effect
@jnblatz
 jenniferblatz
Cognitive Bias
 Default Effect
@jnblatz
 jenniferblatz
Cognitive Bias
 Default Effect
@jnblatz
 jenniferblatz
Cognitive Bias
 Summary
Summary
• Biases affect everyone
• Be open to different and outside ideas
• Need to fit in with the group
• Memory skews
• Use cognitive biases for good
@jnblatz
 jenniferblatz
Cognitive Bias
 So Many Biases
@jnblatz
 jenniferblatz
Jen Blatz
UX Researcher & Designer
Jen Blatz
 Big Design, September 2019
@jnblatz
@jnblatz
jenniferblatz
ux-research-strategy

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Cognitive bias Jen Blatz 9 2019