GLOSSARY

The design of how people act with, receive feedback from and move through products or services to achieve objectives.

Well-designed interactions reduce errors and support costs, improve task completion and trust, and turn functional requirements into usable customer experiences.

A payment flow validates fields without losing entered data, explains errors next to the relevant control, confirms the transaction clearly and supports keyboard and assistive-technology use.

A polished interface cannot compensate for the wrong task, inaccessible foundations or poor service design. Patterns that work in one context may fail for different users, devices or risk levels.

Interaction design specifies behaviours, states, controls, feedback, timing, error handling and transitions across a user flow. Practitioners use task analysis, prototypes and usability evaluation to test whether the interaction is understandable, efficient and accessible.