Interaction Laws

Interaction law visuals

Essentials

  • Fitts law: closer and larger targets are faster to hit
  • Hick law: more visible choices increase decision time
  • Serial position: first and last items are remembered best
  • Pareto principle: a small set of features drives most value
  • Jakob’s law: users prefer familiar patterns

Checklist

  • Can you remove one visible choice on this step
  • Is the primary action inside easy thumb reach on mobile

More reading: Laws of UX.