IB Design Technology Topic B1.1.4: Usability Key Definitions

A usability objective that measures the speed and accuracy with which users can perform the intended task of a product.

A usability objective that measures the number, frequency, and severity of mistakes users make when using a product.

The ease with which a user can reach a defined level of competence with a product or system after a set amount of training or use.

A usability objective that measures how well a user can recall how to use a product after a period of not using it.

A usability objective that reflects how pleasant a product is to use, based on how well it meets the user’s needs, expectations, and preferences.

The degree to which a product enables specified users to achieve defined goals effectively, efficiently, and with consistency and predictability.

Usability objectives include learnability, efficiency, memorability, errors and
satisfaction. These objectives provide a framework for evaluating and improving products.