UX//Heuristic / Principle
Jacob's//_
.UX/Pr

UX//Heuristic / Principle
Jacob's//
.UX/Pr

Jacob's/Law

Jacob's/Law

Jacob's/Law
Users expect digital experiences to behave like the ones they
already know.

UX Jacob
Users expect digital experiences to behave
like the ones they
already know.

UX Jacob
Users expect digital experiences to behave like the ones they
already know.

HOW IT WORKS: Users transfer knowledge from previous experiences to new systems. When interfaces follow familiar layouts, controls, and behaviors, people learn faster, make fewer errors, and feel more confident navigating and completing tasks.


IN UX/UI/AI DESIGN: UX, UI, and AIX designers reuse common design patterns, navigation structures, and interaction models. AI experiences align conversational flows and controls with known mental models to reduce friction and learning effort.


EXAMPLE: A new fintech app uses the same tab navigation, transfer flow, and confirmation patterns found in popular banking apps, while its GenAI assistant follows familiar chat interaction behaviors.

Jacob's Law
Origin

Jacob's Law
Origin

Jacob's Law
Origin

Jacob’s Law, introduced by Jakob Nielsen through usability research, states that users spend most of their time on other products and websites, so their expectations are shaped by existing interface conventions and widely adopted interaction patterns.

Jacob’s Law, introduced by Jakob Nielsen through usability research, states that users spend most of their time on other products and websites, so their expectations are shaped by existing interface conventions and widely adopted interaction patterns.

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