System 2
System 2

Definition
System 2 is our slow, disciplined, effort hungry, largely conscious mind that monitors system 1 and allocates attention to more complex mental problems that require it. However, this system is lazy and will rely on system 1 whenever it thinks it is adequately handling decision making. This concept was introduced by the psychologist Daniel Kahneman in his book Thinking, fast and slow. See also behavioural economics.
Resources:
Conversion marketing – Glossary of Conversion Marketing.
Fluency of text – Does low contrast text kill conversion rates?
System 1 & System 2 – What does psychology tell us about CAPTCHA?
Human decision making – The rationality of decisions.
Over 300 tools reviewed – Digital Marketing Toolbox.
A/B testing software – Which A/B testing tools should you choose?
Types of A/B tests – How to optimise your website’s performance using A/B testing.