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Even though it is better if the system can be used without documentation, it may be necessary to provide help and documentation. Any such information should be easy to search, focused on the user's task, list concrete steps to be carried out, and not be too large. Example: FAQ sections on websites.

Forms should have clearly labeled fields with expected data formats and real-time feedback to correct errors. Example: indicating a required email format or highlighting a wrongly filled field.

Keep users informed about what is going on, through appropriate feedback within a reasonable time. For example, loading indicators when a page is loading.

Users often choose system functions by mistake and will need a clearly marked 'emergency exit' to leave the unwanted state. Example: having a 'Cancel' button during a process.

Make objects, actions, and options visible. The user should not have to remember information from one part of the dialogue to another. Example: breadcrumbs in website navigation.

Websites should be usable across different types of devices and screen sizes, adapting their layout accordingly. Example: responsive web design that adjusts to both mobile phones and desktop screens.

Design interfaces in a way that is tolerant of user error, and if an error occurs, provide simple, constructive, and specific instructions for recovery. Example: confirming file deletions to prevent accidental loss.

Websites should be designed to engage users, encouraging interaction and participation. Example: interactive elements like comment sections or social sharing buttons.

Users should not have to wonder whether different words, situations, or actions mean the same thing. Follow platform conventions. Example: using a floppy disk icon to represent saving.

Even better than good error messages is a careful design that prevents a problem from occurring. Example: form validations that prevent the user from entering invalid data.

Dialogues should not contain information which is irrelevant or rarely needed. Every extra unit of information in a dialogue competes with the relevant units of information and diminishes their relative visibility. Example: clean and simple web design.

Error messages should be expressed in plain language, precisely indicate the problem, and constructively suggest a solution. Example: 'Incorrect password. Try again or click on 'Forgot password?' to reset it.'

Sufficient color contrast should be maintained for readability and aesthetic balance, especially for people with visual impairments. Example: dark text on a light background.

Provide content that is relevant, useful, and high quality to ensure it meets user needs. Example: regularly updated blog posts with valuable information.

Search features should provide suggestions as users type, aiding in the discovery of content. Example: search auto-complete based on common or recent searches.

The system should speak the users' language, with words, phrases, and concepts familiar to the user, rather than system-oriented terms. Example: using 'Trash' to represent discarding a file.

Ensure that users' privacy and security are protected, and communicate this to users. Example: using HTTPS, not storing sensitive data unnecessarily, and clear privacy policies.

Websites should be accessible to users with disabilities, including those who use assistive technologies. Example: alt text for images to aid screen reader users.

Links should convey clear and accurate information about the destination. Example: 'Read more about Web Usability Guidelines' instead of 'Click here'.

Accelerators, unseen by the novice user, may often speed up the interaction for the expert user such that the system can cater to both inexperienced and experienced users. Example: keyboard shortcuts.

Optimize website performance for quick loading times to prevent user frustration and abandonment. Example: compressing images and minifying JavaScript.

Icons should be used consistently throughout the website both in appearance and function. Example: a magnifying glass consistently used for the search function.

Navigation should be intuitive and consistently presented across the website, allowing users to easily orient themselves and move to their desired content. Example: persistent top navigation menus.

Text should be easy to read and understand. Example: using a clear, sizeable font with appropriate spacing.