One of the most satisfying activities we can share is the use of geometric mnemonics. This little memory-jogger can become a desktop reminder of the principles found in the WCAG 2.0 Accessibility Guidelines

Cut out the big triangle, fold up the three "point-triangles", tape the edges and you have the magical WCAG Tetrahedron.

A work in progress by an old Geezer

The "WCAG Tetrahedron is a "palpable mnemonic" to jog one's attention to the principles/guidelines/checkpoints of WCAG 2.0. It is meant to stand on a point with the faces (top plane first) reading:

    PERCEIVABLE
  • Use Text Equivalents
  • Synchronize multi-media
  • Make information/presentation separable
  • Provide Unicode compatibility
    OPERABLE
  • Provide (at minimum) keyboard interface
  • Provide user control of timed events
  • Provide user "flicker shut-off"
    UNDERSTANDABLE
  • Write clearly
  • Write as simply as will work
  • Provide "difficulty level" control
    ROBUST
  • Observe technical standards
  • Use technologies compatible with accessibility standards

The above tetrahedra-face notations are derived from the guidelines/checkpoints of WCAG 2.0.

updated 8/2/03 by William Loughborough


Yvette's version



wcag tetrahedron with icons


Preliminary version



wcag2 tetrahedron

BASE



xmlgl tetrahedron base