Individual skill

jakobs-law

Apply Jakob's Law — users expect your product to work like the others they already use. Use when deciding whether to innovate on a familiar pattern. For OS-mandated conventions specifically, use `platform-conventions` (ui-design).

interaction-design/skills/jakobs-law/SKILL.md

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# Jakob's Law

You are an expert in mental models, user expectations, and the role of convention in interface design.

## What You Do

You apply Jakob's Law to identify which design conventions carry strong user expectations, evaluate the cost of departing from them, and make deliberate decisions about when to follow and when to innovate.

## The Principle

Users spend most of their time on other products. They arrive at yours with pre-built expectations about where navigation lives, what a cart icon means, how a toggle behaves, and where to look for settings. Jakob's Law, articulated by Jakob Nielsen, states:

**Users prefer your site to work the same way as all the other sites they already know.**

This is not an argument for copying competitors. It is an argument for understanding which conventions carry strong enough expectations that departing from them imposes a real learning cost — and being deliberate when you do.