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Evaluates how easy it is for users to accomplish basic tasks the first time they encounter the design. Important because it can determine a user's first impression and willingness to continue using the product.

The extent to which a product can be used by people with the widest range of abilities. It's important to ensure inclusivity and compliance with legal standards.

Tracks the number and severity of errors made by users. Important for identifying potential areas for improvement in the design to prevent user mistakes.

Assesses how pleasing and acceptable the product is from the user's perspective. It's important because user approval often correlates with market success and brand loyalty.

An expert-based assessment of the user interface against established usability principles. Important for early identification of usability issues before user testing.

Refers to how simple and intuitive a product is for users to operate. It's important because it directly affects the user's ability to complete tasks efficiently without frustration.

Assesses how easily and quickly a user can recover from an error. This is critical for ensuring that errors do not lead to prolonged confusion or task abandonment.

Measures how easily users can reestablish proficiency after a period of not using the product. Important to ensure long-term usability and user retention.

Measures the percentage of correctly completed tasks by users. Important as an objective indicator of a product's usability and effectiveness.