Understanding Bottom-Up Design

Conventional, top-down design approaches start with the big picture before breaking these goals and concepts into smaller details. Bottom-up philosophies, by contrast, consider the minute details first, eventually achieving the broader goal piece by piece.

This alternative way of thinking is important for accessibility in general because it reflects how neurodivergent people commonly think. While non-autistic people tend to think from a top-down perspective, those with autism often employ a bottom-up way of thinking.

Of course, there is considerable variation, and researchers have identified at least three specialist thinking types within the autism spectrum:

• Visual thinkers who think in images;

• Pattern thinkers who think of concepts in terms of patterns and relationships;

• Verbal thinkers who think only in word detail.

Still, research shows that people with autism and ADHD show a bias toward bottom-up thinking rather than the top-down approach you often see in neurotypical users. Consequently, a top-down strategy means you may miss details your audience may notice, and your site may not feel easily usable for all users.