- Complex interfaces and clutter: Overwhelming layouts, dense menus, and inconsistent navigation increase cognitive load and cause confusion. (ISO 9241-210; W3C WCAG 2.1)
- Unclear language and instructions: Jargon, long sentences, implicit assumptions, and lack of plain-language options hinder comprehension and task completion. (Plain Language guidelines)
- Memory and attention demands: Tasks that require holding steps in working memory, multitasking, or sustained attention (e.g., CAPTCHA, time-limited forms) create barriers.
- Problem-solving and flexibility requirements: Nonlinear flows, ambiguous error messages, or lack of guided workflows make recovery from mistakes difficult.
- Visual and perceptual challenges: Small fonts, low contrast, and information presented only visually (icons without labels) impede understanding.
- Sensory overload from motion and animation: Excessive motion, flashing content, or auto-playing media distract and can trigger anxiety.
- Inaccessible multimedia: Videos without captions, transcripts, or easy-to-follow summaries exclude users who rely on simplified or alternative representations.
- Lack of personalization and support: Few options to simplify interfaces (reduced choices, progressive disclosure), adjust pacing, or access help (contextual hints, tutorials).
- Authentication and security hurdles: Complex passwords, CAPTCHA, and multi-step verification can be especially hard to complete or remember.
- Inadequate testing and representation: Design teams often lack users with cognitive disabilities in research, so solutions miss real needs. (Inclusive design literature; W3C Cognitive and Learning Disabilities Accessibility Task Force)
References for further reading: W3C WCAG 2.1, W3C Cognitive & Learning Disabilities TF resources, "Designing for People with Cognitive Disabilities" (Nielsen Norman Group).