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What are important rules for designing user interfaces?

A user expects a screen to be mostly filled with meaningful content. A developer must design systems that expand without needing a rewrite. A designer must use consistent colors and navigation.

By Pawan Nayar · from the LLOS AI Learning record

The rule

A user expects a screen to be mostly filled with meaningful content.

A developer must design systems that expand without needing a rewrite. A designer must use consistent colors and navigation.

A user will leave a page if it looks empty. Every screen should be 70-90% full of content. The content should be meaningful. The experience of using the page is as important as the content itself. Navigation should lead to the next logical action. If there is no clear next step, navigation should go to the top of the page. Systems must be built to grow without being rewritten. Colors must be consistent. Use the correct colors for primary actions, saved items, success messages, and errors. Text length matters. If text is too short, a user finishes reading before an animation ends. Text that is 30-50 words is often ideal. Never waste space on lists. Avoid three-column layouts, as they can be confusing. Content should be dynamic and change. Always read all design documents completely. On mobile, use single-row navigation for quizzes or carousels.

A developer creates a new feature. The developer uses a three-column layout for displaying information. A user finds the layout confusing and leaves the page. The developer learns that three-column asymmetry is a design problem.

Words you'll need

Resolved from this lesson's own record — real definitions, not invented for this page.

Human-Computer Interaction

How people and computers communicate and work together

Design Patterns

Reusable solutions to common problems in design

System Scalability

How well AI systems handle growing demands

Questions people ask

More from the same record, pulled by shared topic — not written new for this page.

When should a developer use a component instead of writing new text?

A developer should always check for an existing component first. If a component exists for the content type, the developer must use it.

How should a developer design a simple HTML viewer or utility page?

A developer should never release an HTML page with basic, dark-themed styling. Even a temporary search tool must look good.

How do I make sure a new companion page matches the main product's design and works everywhere?

The companion page must use the same visual style as the main product. This means using the same colors, fonts, and layout.

What are the key design rules for building a user interface?

Do not use standard browser pop-up boxes like `confirm()`, `alert()`, or `prompt()`. Instead, use custom modal windows that match the application's design.

What to remember

A user expects a screen to be mostly filled with meaningful content. A developer must design systems that expand without needing a rewrite. A designer must use consistent colors and navigation.