Cognitive Biases in Testing Srikanth S Krishnan Sr. Director QA Oracle India Srikanth S Krishnan Sr. Director QA Oracle India.

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Presentation transcript:

Cognitive Biases in Testing Srikanth S Krishnan Sr. Director QA Oracle India Srikanth S Krishnan Sr. Director QA Oracle India

What is a Cognitive Bias ?

It is the human tendency to make systematic errors in certain circumstances based on cognitive factors rather than evidence.

Heuristics Statistical mis-estimates Memory errors Social Constructs

Tester’s Delusion Spots Test Planning Test Design Test Advocacy

Anchoring

Guess the percentage of African Nations in the UN.

Anchoring Will you be happier if you get a 100% raise?

Bidding after stating the last 2 digits of social security number

Why are black pearls more expensive?

occurs when people consider a particular value for an unknown quantity before estimating that quantity

Effect on Estimation New Feature vs. regression testing of existing features

Effect on Negotiation

Relativity

Would you mind walking 5 min to save $10 on a $ 50 pen?

Would you mind walking 5 min to save $10 on a $ 1000 suit?

Decoy Effect or Asymmetric dominance effect

Option AOption B Coverage Cost

Option AOption BOption C Coverage Cost

People not only compare things, but also compare things that are easily comparable.

The Price of Ownership Endowment Effect

How much would you pay for a Coffee Mug ?

Applies to ideas as well as objects.

The more effort you put into something the more ownership you feel. IKEA Effect

Ex. Manager from Finance

Test repository clean up Which one will you get rid of? (assume similar coverage) Suite1 Created with 100 man days effort Suite2 Created with 30 man days effort

Effect of Expectation Confirmation bias: Self-Fulfilling Prophecy

How do you get more women in the orchestra?

Positive vs. negative Test cases.

Seeing patterns where none exist.

e xi st

Influence of great UI.

Negativity Bias More attention is given to negative than positive experiences

The lingering effect of a nasty bug.

Sunk Costs

Concorde Fallacy “I have spent so much time doing the setups.”

Concorde Fallacy Why test a build that has been obsoleted?

Paradox of Choice

Concorde Fallacy More is not always better

Burn your bridges

Concorde Fallacy Why don’t we keep this server just in case?

Procrastination

Concorde Fallacy Choose your own deadline

Concorde Fallacy The hockey-stick effort curve

Concorde Fallacy Milestones and distributed deadlines

Resurrection to Rationality

overcoming channeling

References and Acknowledgements Predictably Irrational – Dan Ariely Nudge – Thaler & Sunstein Blink – Malcolm Gladwell Sway – Brafman (Ori & Rom) Wikipedia Predictably Irrational – Dan Ariely Nudge – Thaler & Sunstein Blink – Malcolm Gladwell Sway – Brafman (Ori & Rom) Wikipedia

Concorde Fallacy Thank You Twitter: sriks7