Hick's law states that the longer the list, the longer it takes to make a selection

• aka Hick-Hyman Law
• A model of decision time for a set of choices

principle

• The longer the list, the longer it takes to make a selection
• Long lists work when
  • In order
  • Known by user

equation

• Number of equally probable alternatives (n)
• Entropy of decision (H)

$$H=lo{g}_2(n+1)$$

references

• The Human-Computer Interaction Handbook - Input Technologies and Techniques