Inclusive Design: Core Principles for Designing for Everyone

ENGLISH VERSION

What Is Inclusive Design and Why Should You Care?

Think about the last time you tried to open a door while carrying grocery bags. If the door had a round knob, you struggled. If it had a horizontal push bar you could nudge with your elbow, you sailed through. That push bar wasn’t designed exclusively for people with motor disabilities—it was designed for everyone. And that, at its core, is inclusive design.

Inclusive design is a methodology that aims to create products, services, and experiences that work for the broadest possible diversity of people. It’s not about building special versions for specific groups; it’s about designing from the start with human variability in mind. As Kat Holmes, former Director of Inclusive Design at Microsoft and author of “Mismatch: How Inclusion Shapes Design,” puts it: “Exclusion is not a user’s problem—it’s a designer’s problem.”

Personally, I believe inclusive design is the natural evolution of user-centered design. Why? Because user-centered design often focuses on an “average” user who doesn’t actually exist. According to the World Health Organization, over 1.3 billion people—16% of the global population—live with some form of disability. If you design only for the “average,” you’re excluding one in every six people.

Inclusive Design vs. Universal Design vs. Accessibility: Are They the Same?

Have you ever mixed up these terms? Don’t worry—most people do. Let’s clear it up once and for all:

Inclusive design is the process, universal design is the aspiration, and accessibility is the measurable standard. All three complement each other. You can have a product that is technically accessible (meets WCAG 2.2 Level AA) but isn’t inclusive because you never involved people with disabilities in the design process.

Microsoft’s 3 Principles of Inclusive Design

The Microsoft Inclusive Design Toolkit, one of the most influential guides in the field, establishes three core principles:

1. Recognize Exclusion

Exclusion happens when there is a mismatch between a person and their environment. It’s not the person who “has a problem”—it’s the design that fails. A video without captions doesn’t just exclude Deaf people: it also excludes someone in a noisy café, someone learning the language, or someone watching on public transport without headphones.

Microsoft identifies three types of exclusion: permanent (a person with one arm), temporary (an arm in a sling), and situational (a parent holding a baby). All three need to use a phone one-handed. Designing for one benefits all.

2. Learn from Diversity

People with disabilities are experts in adaptation. They have spent years finding creative ways to interact with a world that wasn’t designed for them. Including them in the design process isn’t charity—it’s a competitive advantage. Both the Apple Human Interface Guidelines (HIG) and Google Material Design guidelines acknowledge that the best insights emerge when you include diverse perspectives from the start.

Did you know that SMS, television captions, audiobooks, and email all originated as solutions for people with disabilities? They later became products used by everyone. That’s what IDEO, the world’s most influential design consultancy, calls the “curb cut effect”: a solution built for the few benefits the many.

3. Solve for One, Extend to Many

This principle is the heart of inclusive design. When you design for a person in an extreme situation, you create solutions that benefit a much wider audience. Voice control was designed for people who couldn’t use their hands; today we all use it through Siri, Alexa, and Google Assistant.

Accessibility by Default: The Shift-Left Approach

How many times have you seen accessibility tacked on at the end of a project, like slapping a bandage on a deep wound? That doesn’t work. The shift-left approach means moving accessibility to the beginning of the design process, not the end.

According to a Forrester Research study commissioned by Microsoft, fixing an accessibility issue during the design phase costs 1x. During development, it costs 6.5x. In production, 15x. Personally, I’ve seen projects where retrofitting accessibility at the end cost more than the entire original design.

Accessibility by default means embedding WCAG criteria from the wireframe and prototype stage. It’s not about ticking off a checklist—it’s about ensuring every design decision considers the impact on people with varying abilities.

How to Apply Inclusive Design in Your Daily Work

1. Personas and the Capability Spectrum

Instead of creating “typical” user personas, create a capability spectrum. For each core task in your product, ask: what happens if the user can’t see? Can’t hear? Has reduced mobility? Is in a noisy environment? Is using the product for the first time?

2. Contrast and Typography

The WCAG minimum contrast ratio of 4.5:1 for normal text and 3:1 for large text isn’t arbitrary—it’s the baseline for people with low vision or colour blindness to read your content. Google Material Design 3 and the Apple HIG both include accessible colour systems by default.

3. Keyboard Navigation

All functionality in your product must be keyboard-accessible. Not just for people who can’t use a mouse: power users prefer keyboard shortcuts because they’re faster.

4. Accessible Multimedia Content

Videos with captions and audio descriptions. Images with meaningful alt text. Audio with transcripts. This isn’t optional—it’s a legal requirement in the EU since June 2025 (European Accessibility Act).

Tools and Resources for Inclusive Design

Data That Proves the Impact of Inclusive Design

• 71% of users with disabilities leave a website that isn’t accessible (Click-Away Pound Survey, 2019).
• Companies with diversity and inclusion practices are 35% more likely to outperform competitors (McKinsey, 2020).
• The disability market represents $13 trillion in global spending power (Return on Disability, 2020).
• Captions increase video engagement by 80% (Verizon Media / Publicis, 2019).
• 97.4% of the top 1,000,000 website homepages have automatically detectable accessibility errors (WebAIM Million, 2024).