IB Design Technology Topic B1.1: User-centred Design 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 persona is a fictional but realistic profile of the target user, based on real data and insights gathered from user research. It represents their goals, needs, behaviours, and limitations to help guide design decisions.

A type of question that focuses research to find the required answers.

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.

Task analysis is the process of observing and studying a user as they perform a task, to understand how they interact with a product or system. The goal is to identify steps, challenges, and opportunities for improvement in the user experience.

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.