UX Laws · Foundation
Jakob's Law
People bring expectations learned from other products.
5 minute field note
Helps create
Lower learning effort
Overview
Make the interface carry more of the effort.
Use familiar conventions for common tasks, then spend novelty where it creates meaningful value.
Human impact
Why it matters
People bring expectations learned from other products. When the interface does not account for this, people spend effort interpreting the product instead of completing the task. Applied with context, the principle supports lower learning effort without removing meaningful choice or control.
Design hypothesis
If we apply Jakob's Law to the decision point, people should reach lower learning effort with less avoidable friction.
Mechanism
How it works
Notice where the task currently asks people to conventions or mental models without enough support.
Use familiar conventions for common tasks, then spend novelty where it creates meaningful value.
Make the smallest change that should improve lower learning effort, then compare the task before and after.
Try the principle
Same capability, clearer presentation
Start your first project
Use a template or begin with a blank workspace.
Why it helps: the common path is clear while alternatives remain available.
Decision guide
When to use it
Apply it
Practical checklist
Use familiar names for familiar tasks.
Keep standard controls behaving in expected ways.
Explain unavoidable differences before they cause errors.
Test new patterns with people who did not design them.
Watch for
Common mistakes
Copying a competitor pattern without understanding its context.
Using novelty to decorate a routine task.
Assuming industry familiarity is universal familiarity.
Accessibility considerations
Preserve expected keyboard and assistive-technology behavior.
Use established semantics even when the visual treatment is new.
Evidence plan
How to test it
Compare the decision, not the decoration.
Prototype the current and proposed decision point with the same content. Give representative people the same goal and compare time, errors, confidence and explanation quality.
Observe
Where choice, attention or memory effort changes and whether people still understand the consequences.
Decide
Use the version that supports lower learning effort while preserving informed choice.
Use with judgment
Limits and trade-offs
Jakob's Law is a decision lens, not a universal prescription. Context, frequency, expertise and consequence can change the right implementation.
Optimising only for lower learning effort can create new costs elsewhere. Recheck access, comprehension, user control and business constraints together.
A polished prototype can still fail in real use. Validate consequential decisions with representative people and realistic content.
Design responsibly
Better outcomes must also be honest outcomes.
Use the principle to reduce avoidable effort, not to pressure people into a choice.
Keep price, risk, consent and irreversible consequences visible before commitment.
Record what evidence supports the decision and what remains an assumption.
Evidence
Sources and interpretation
Design principles are lenses, not automatic answers. Apply them in context and validate consequential decisions with users and accessibility testing.
Keep close
Key takeaways
People bring expectations learned from other products.
Use familiar names for familiar tasks.
Use the version that supports lower learning effort while preserving informed choice.