IxDF Certificate of Completion

Web Design for Usability

IxDF Course Certificate awarded to Tadek Wadas for completing the "Web Design for Usability" course
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The Interaction Design Foundation (IxDF) hereby certifies that the IxDF Course Certificate (ID #ae58a8f5-2477-475c-9c41-a05e40d30766) has been conferred upon Tadek Wadas with a Top 10% Course Taker Distinction in formal recognition of completing evidence-based curricula taught by industry leaders, to the standards established by the IxDF Educational Codex. View Course Curriculum.

This document serves as the official record of the above credential. Third parties may reference the certificate ID to verify its authenticity. The Interaction Design Foundation maintains permanent records of all credentials issued.

Verified Competencies Demonstrated by Tadek Wadas

By completing this curriculum to the standards of the IxDF Educational Codex, Tadek Wadas has demonstrated mastery of how to:

  • Apply ISO-standard user-centered design principles (effectiveness, efficiency, and satisfaction) to deliver websites that drive business outcomes rather than just look good.

  • Diagnose where users get stuck using Don Norman's interaction model, the four goal-mapping questions, and hierarchical task analysis.

  • Plan and conduct user observation and interviews to surface what users actually do beyond what they say they do.

  • Choose the most appropriate usability evaluation method from heuristic reviews, walkthroughs with users, and usability testing with real users.

  • Plan, run, and analyze usability tests early and often.

  • Understand the legal accessibility requirements under the ADA, Section 508 of the Rehabilitation Act, the Disability Discrimination Acts, the European Convention on Human Rights, and equivalent national laws.

  • Apply the WCAG four principles and design websites that work with assistive technologies to reach a wider audience.

  • Develop research-grounded personas and persona stories that promote team empathy and sharpen design focus.

  • Design navigation, hyperlinks, and breadcrumbs that reflect a coherent conceptual model, place primary and secondary menus where users expect them, work on touch devices, and orient users who arrive from search engines on internal pages.

  • Organize web content around primary persona goals using the inverted pyramid structure, plain words, one key idea per paragraph, balanced prose and bullets, and on-page anchors, so visitors quickly judge whether they are on the right page.

  • Provide feedback close in timing, location, and meaning to the event it relates to, use validation and error messages as a last resort, preserve user-entered data, and translate technical errors into plain language so users can recover without losing their work.

  • Account for change blindness so error indicators are actually seen, and design confirmation flows that leave users certain a transaction has succeeded.

  • Apply the Gestalt principles of perception and grid-based layouts, and honor expected layout conventions, to reduce cognitive load, speed task completion, and lower bounce on first-time visits.

  • Design forms that respect user time and treat input as valuable.

  • Use color strategically, never relying on color alone to communicate meaning, choosing combinations that meet WCAG contrast ratios, and adapting to cultural context.

  • Plan, run, and interpret open and closed card sorts using hierarchical cluster analysis so that navigation labels and form fields match the words users actually search for, reducing support tickets and abandoned carts.

  • Run paper prototype sessions to test concepts with users at minimal cost before any code is written.

  • IxDF Outstanding
 Learner Award
    IxDF Outstanding Learner Award distinction: Completed 15 IxDF Courses
  • IxDF Top 10%
 Course Taker
    IxDF Top 10% Course Taker distinction: Completed an IxDF course with a score of 90%
  • IxDF Assiduous
 Learner Award
    IxDF Assiduous Learner Award distinction: Completed 5 IxDF Courses
  • IxDF 
Community Explorer
    IxDF Community Explorer distinction: Attended 3 IxDF Meetups
  • More distinctions
    +3

AYLESBURY, United Kingdom

Tadek Wadas

Interaction Designer

IxDF Distinctions

Distinctions are conferred upon Tadek Wadas in formal recognition of their notable achievements and contributions, as stipulated by the IxDF Educational Codex.

IxDF Assiduous
 Learner Award Distinction IxDF Assiduous Learner Award
Completed 5
IxDF Courses
IxDF Certified
 Course Completer Distinction IxDF Certified Course Completer
Completed one or more
IxDF Courses.
IxDF 
Community Explorer Distinction IxDF Community Explorer
Attended 3 IxDF Meetups
IxDF Local
 Group Member Distinction IxDF Local Group Member
Member of an
IxDF Local Group
IxDF Master
 Class Learner Distinction IxDF Master Class Learner
Completed one or more
IxDF Master Classes
IxDF Outstanding
 Learner Award Distinction IxDF Outstanding Learner Award
Completed 15
IxDF Courses
IxDF Top 10%
 Course Taker Distinction IxDF Top 10% Course Taker
Completed an IxDF course
with a score of 90%
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Certificates Earned
by Tadek Wadas

IxDF Course Certificates are awarded to Tadek Wadas in formal recognition of completing evidence-based curricula taught by industry leaders, to the standards established by the IxDF Educational Codex.

IxDF Master Class Certificates Earned

IxDF Master Class Certificates are awarded to Tadek Wadas in formal recognition of their attendance and ongoing commitment to learning from industry leaders.

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Agentic AI for Everyone: How to Integrate Agents into Your Day-to-Day Work certificate

Agentic AI for Everyone: How to Integrate Agents into Your Day-to-Day Work

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How to Build Agentic AI Workflows for Product Design: Go from Prompts to Systems certificate

How to Build Agentic AI Workflows for Product Design: Go from Prompts to Systems

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Vibe Coding for Everyone: Build and Launch Real Products with AI certificate

Vibe Coding for Everyone: Build and Launch Real Products with AI

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AI in Healthcare UX: How You Can Design Trustworthy Interfaces in High-Stakes Environments certificate

AI in Healthcare UX: How You Can Design Trustworthy Interfaces in High-Stakes Environments

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Design for AI Agents: Healthcare and High-Stakes Systems certificate

Design for AI Agents: Healthcare and High-Stakes Systems

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The AI Playbook: How to Capitalize on Machine Learning certificate

The AI Playbook: How to Capitalize on Machine Learning

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Design for Everyone: A Firsthand Perspective on Accessibility certificate

Design for Everyone: A Firsthand Perspective on Accessibility

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Design Systems: How to Write Documentation People Will Actually Use certificate

Design Systems: How to Write Documentation People Will Actually Use

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Healthcare UX: Design for Patient Engagement and Technology Adoption certificate

Healthcare UX: Design for Patient Engagement and Technology Adoption

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User Research for Everyone: Practical Strategies for Every Team certificate

User Research for Everyone: Practical Strategies for Every Team

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How to Design for the Human Mind: Cognitive Science for UX certificate

How to Design for the Human Mind: Cognitive Science for UX

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Design for Adaptability: Component-Driven Information Architecture certificate

Design for Adaptability: Component-Driven Information Architecture

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How to Elevate Your Portfolio: Sketching Your Design Process certificate

How to Elevate Your Portfolio: Sketching Your Design Process

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User Stories Don't Help Users: Introducing Persona Stories certificate

User Stories Don't Help Users: Introducing Persona Stories

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How to Design for Neurodiversity: Inclusive Content and UX certificate

How to Design for Neurodiversity: Inclusive Content and UX

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Boost Mobile UX with UX Design Principles and Best Practices certificate

Boost Mobile UX with UX Design Principles and Best Practices

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How to Create Complex Tables Users Love: A UI Designer's Guide certificate

How to Create Complex Tables Users Love: A UI Designer's Guide

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A Guide to Hassle-Free Designer-Developer Collaboration certificate

A Guide to Hassle-Free Designer-Developer Collaboration

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Beyond Interfaces: The UI Design Skills You Need to Know certificate

Beyond Interfaces: The UI Design Skills You Need to Know

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Mental Models: How to Design for the Way Your Users Think certificate

Mental Models: How to Design for the Way Your Users Think

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Inclusive Design: Build Inclusion into Your Design Process certificate

Inclusive Design: Build Inclusion into Your Design Process

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How to Use Card Sorting for Better Information Architecture certificate

How to Use Card Sorting for Better Information Architecture

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Behavioral Design: Create Engaging Products with Behavioral Science certificate

Behavioral Design: Create Engaging Products with Behavioral Science

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How to Attract Users Through Great Onboarding Experiences certificate

How to Attract Users Through Great Onboarding Experiences

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UX Magic: Achieve 10X Better Designs Through Semantic Interaction Design certificate

UX Magic: Achieve 10X Better Designs Through Semantic Interaction Design

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Win Clients, Pitches and Approval: Present Your Designs Effectively certificate

Win Clients, Pitches and Approval: Present Your Designs Effectively

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IxDF Membership Certificate

This IxDF Membership Certificate (ID #QpGfzx6zX) has been issued to Tadek Wadas in formal recognition of their membership of the Interaction Design Foundation (IxDF).

The authenticity of this membership certificate can be verified on this permanent link.

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