IxDF Certificate of Completion

Apply Norman's usability principles of visibility, findability, feedback, constraints, and mapping as a repeatable evaluation method for any screen-based interface.

Identify perceptible, hidden, and false affordances using Gaver's framework to evaluate where perception breaks down and why.

Diagnose interaction failures at the level of Hartson's four affordance types (cognitive, physical, sensory, and functional) and identify precisely which type broke down and at which moment.

Evaluate conceptual models by identifying mismatches between the designer's model, the system image, and the user's mental model that cause errors and frustration.

Design cognitive affordances (labels, instructions, icons, and symbols) that tell users what they can do, where they can do it, and what will happen when they do.

Use physical, cultural, and semantic constraints to direct user behavior and reduce errors in graphical user interfaces.

Distinguish between Norman's real and perceived affordances to diagnose exactly why users misread or miss interactive elements in graphical user interfaces.

Structure complex multi-step interactions using Gaver's sequential and nested affordance principles to reduce cognitive load and guide users through tasks with speed and accuracy.

Apply Gibson's ecological approach to identify action possibilities in screen-based interfaces and design interactions grounded in how users naturally perceive and act on their environment.

Use Norman's four principles for screen design (convention, words, metaphors, and conceptual models) to create interfaces users understand without instruction.

Evaluate the physical qualities of interface elements using Hartson's physical affordance framework and Fitts's Law to assess ease of interaction and optimize element size, shape, and location.

Apply Hartson's sensory affordance principles to ensure users can perceive interactive elements through text legibility, visual contrast, and auditory feedback.

Design interfaces where users form accurate conceptual models before they interact, using Rogers, Sharp, and Preece's four components (metaphors, concepts, relationships, and mappings).