IxDF Certificate of Completion

Perception and Memory in HCI and UX

IxDF Course Certificate awarded to Leonidas Lazos for completing the "Perception and Memory in HCI and UX" course

The Interaction Design Foundation (IxDF) hereby certifies that the IxDF Course Certificate (ID #0fde79a3-51cf-435c-b109-eda6e2cee6b1) has been conferred upon Leonidas Lazos with a Best in Class 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 Leonidas Lazos

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

  • Apply the interaction model and five-step goal-mapping walkthrough, including the 90-second time-out rule, to identify exactly where a design fails to give users the evidence they need to act and determine what needs to change.

  • Apply George Miller's Magical Number Seven and the Atkinson-Shiffrin multi-store model to design interfaces that work with human memory rather than against it, to reduce errors and support task completion.

  • Distinguish between sensory, short-term, and long-term memory and use that knowledge to reduce friction in user flows and support users in completing tasks accurately.

  • Account for how cross-sensory dependencies between sight, touch, and proprioception create failure points in single-channel interface designs, and propose design solutions that address them.

  • Design for users affected by illness, disability, age, stress, and fatigue, not as exceptions but as an expected part of the user population, producing interfaces that hold up across the full spectrum of human ability.

  • Evaluate color, contrast, and motion against the known limits of human visual perception, including the one-second peripheral motion threshold, to make specific, substantiated decisions about animation and notification design.

  • Use the ecological sound and earcon framework to design auditory feedback to carry meaningful information through pitch, timbre, and harmonic complexity, and evaluate when visual or auditory channels are appropriate for a given user context.

  • Identify where an interface demands recall from users when recognition would serve them better, and produce annotated learnability evidence to demonstrate where design supports new users and where it fails them.

  • Conduct an accessibility audit against WCAG perceivable guidelines to identify where a design excludes users across vision, hearing, and cognitive ability, and produce a documented checklist of what works and what fails.

  • Recognize how confabulation and memory reconstruction affect the reliability of user research data, and account for those risks when interpreting findings and making design decisions.

View Profile: Leonidas Lazos
  • 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 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

42719, Germany

Leonidas Lazos

Expert Software Engineer

IxDF Distinctions

Distinctions are conferred upon Leonidas Lazos 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 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 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 Top 10% Course Taker Distinction IxDF Top 10% Course Taker
Completed an IxDF course
with a score of 90%

Certificates Earned
by Leonidas Lazos

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

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Human-Computer Interaction: The Foundations of UX Design certificate

Human-Computer Interaction: The Foundations of UX Design

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The Brain and Technology: Brain Science in Interface Design certificate

The Brain and Technology: Brain Science in Interface Design

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IxDF Master Class Certificates Earned

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

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Sketch with Confidence: The Skill That Gets Your Design Thinking Out of Your Head certificate

Sketch with Confidence: The Skill That Gets Your Design Thinking Out of Your Head

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Align Teams, Save Time and Reduce Stress with Communication Systems certificate

Align Teams, Save Time and Reduce Stress with Communication Systems

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Demonstrate the ROI of Design Thinking and Win Stakeholder Support certificate

Demonstrate the ROI of Design Thinking and Win Stakeholder Support

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What's Your Best Career Move? Why Building a Design Community Was Mine certificate

What's Your Best Career Move? Why Building a Design Community Was Mine

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How to Break into UI Design: Design Skills That Make You Irreplaceable by AI certificate

How to Break into UI Design: Design Skills That Make You Irreplaceable by AI

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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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The Human Experience: Drive Growth with a Customer-Led Approach certificate

The Human Experience: Drive Growth with a Customer-Led Approach

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Innovate with Design Thinking: Your Shortcut to Results certificate

Innovate with Design Thinking: Your Shortcut to Results

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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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Learning Experience Design That Delivers Impact: A Step-by-Step Guide certificate

Learning Experience Design That Delivers Impact: A Step-by-Step Guide

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Hooked: How to Build Habit-Forming Products with Nir Eyal certificate

Hooked: How to Build Habit-Forming Products with Nir Eyal

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Storytelling That Sells UX Design: Define Requirements and Engage Leadership certificate

Storytelling That Sells UX Design: Define Requirements and Engage Leadership

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Influence Product Strategy with Design: Learn from a Booking.com Case Study certificate

Influence Product Strategy with Design: Learn from a Booking.com Case Study

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Earn Your Seat at the Table: Leadership Lessons for Designers certificate

Earn Your Seat at the Table: Leadership Lessons for Designers

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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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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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How to Create Successful Design Systems with Storytelling certificate

How to Create Successful Design Systems with Storytelling

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Radical Participatory Design: Insights From NASA’s Service Design Lead certificate

Radical Participatory Design: Insights From NASA’s Service Design Lead

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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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How to Design for Neurodiversity: Inclusive Content and UX certificate

How to Design for Neurodiversity: Inclusive Content and UX

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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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How to Break into UX Design and Product Design: A Career Change Guide certificate

How to Break into UX Design and Product Design: A Career Change Guide

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Exclusive: Design for a Better World, a Discussion with Don Norman certificate

Exclusive: Design for a Better World, a Discussion with Don Norman

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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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Design For Agile: Common Mistakes and How to Avoid Them certificate

Design For Agile: Common Mistakes and How to Avoid Them

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IxDF Membership Certificate

This IxDF Membership Certificate (ID #mc_Rdj9KxFPM) has been issued to Leonidas Lazos 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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