IxDF Certificate of Completion

Web Design for Usability

IxDF Course Certificate awarded to Theodor-Constantin Buna 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 #be3814bf-3c1d-4ef0-8593-386ce921887e) has been conferred upon Theodor-Constantin Buna 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 Theodor-Constantin Buna

By completing this curriculum to the standards of the IxDF Educational Codex, Theodor-Constantin Buna 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.

Theodor-Constantin Buna

Theodor-Constantin Buna

Media Designer for Digital and Print

Wiener Neudorf, Austria
  • IxDF
 Best-in-Class
    IxDF Best-in-Class distinction: Completed an IxDF Course with a score of 100%
  • IxDF Top 10%
 Course Taker
    IxDF Top 10% Course Taker distinction: Completed an IxDF course with a score of 90%
  • IxDF Social
 Impact Award
    IxDF Social Impact Award distinction: Significantly helped other IxDF Members
  • IxDF Local
 Group Member
    IxDF Local Group Member distinction: Member of an IxDF Local Group
  • More distinctions
    +3

IxDF Distinctions

Distinctions are conferred upon Theodor-Constantin Buna in formal recognition of their notable achievements and contributions, as stipulated by the IxDF Educational Codex.

IxDF
 Best-in-Class Distinction IxDF Best-in-Class
Completed an IxDF Course
with a score of 100%
IxDF Certified
 Course Completer Distinction IxDF Certified Course Completer
Completed one or more
IxDF Courses.
IxDF Community Influencer Distinction IxDF Community Influencer
Contributed meaningfully
to IxDF Conversations
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 Social
 Impact Award Distinction IxDF Social Impact Award
Significantly helped other
IxDF Members
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 Theodor-Constantin Buna

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

View Certificate
Object-Oriented UI Design: Build Interfaces Users Love certificate

Object-Oriented UI Design: Build Interfaces Users Love

View Certificate

IxDF Master Class Certificates Earned

IxDF Master Class Certificates are awarded to Theodor-Constantin Buna in formal recognition of their attendance and ongoing commitment to learning from industry leaders.

IxDF Membership Certificate

This IxDF Membership Certificate (ID #mc_theodor-constantin-buna) has been issued to Theodor-Constantin Buna 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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