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Professional Software Development:
Thinking, Fast and Slow
Daniel Bryant
CTO, Instant Access Technologies
d.bryant@iatltd.com
@taidevcouk
Thinking, Fast and Slow
An awesome book!
Exploring how we think…
“Bias and decision heuristics”
amzn.to/KidCCy
21/03/2014 @taidevcouk
Your Thinking: A Tale of Two Systems…
System 1:
fast, instinctive, emotional, subconscious
Systemic errors
System 2:
slower, deliberate, reasoning, conscious
Lazy, and causal (not statistical)
21/03/2014 @taidevcouk
Heuristics / biases affecting software developers
21/03/2014 @taidevcouk
Availability Heuristic
“If something can be recalled,
it must be important”
Ever notice that MongoDB are at every conference?
…and every application seems to use MongoDB?
21/03/2014 @taidevcouk
21/03/2014 @taidevcouk
Substitution Heuristic
“…a computationally complex judgment
will be substituted
for a more easily calculated heuristic”
Observe what happens when you ask…
‘Is Scala a good choice for your current project?’
21/03/2014 @taidevcouk
21/03/2014 @taidevcouk
Anchoring Bias
“Common tendency to rely too heavily
on the first piece of information offered
when making decisions. ”
How does your manager ask for estimates?
…is it an unbiased question?
21/03/2014 @taidevcouk
21/03/2014 @taidevcouk
Thinking Professionally
• Availability
– Constant learning and evaluation
– Spike, prototype, experiment…
• Substitution
– Matt Raible comparison matrix (bit.ly/OxUzad)
• Anchoring
– ‘Clean Coder’ PERT Estimation (amzn.to/1dr0SSW)
21/03/2014 @taidevcouk
Thanks for Listening!
This is a beta lightning talk…
… was it interesting? Please let me know!
Contact me:
d.bryant@iatltd.com
@taidevcouk
21/03/2014 @taidevcouk

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Software Development: Thinking, Fast and Slow