Welcome to BBC UX&D. We do the layer between people and technology. Every day, we focus on the stuff that makes things special, as well as the stuff that makes things happen. As a multi-disciplinary team united by a human-centred approach, we work together to design the BBC’s digital experiences. GEL = Global Experience Language

Get our free Color Theory Poster here! It's a wallpaper or print-ready file - your choice.

Last year, we created a Color Theory Quick Reference Poster – a cheat sheet designed to give you a quick overview of color theory at a glance. It proved fairly popular with the design community, as we received our biggest bump in traffic yet from it, and it remains one of Paper Leaf Design’s most popular...

The Encyclopedia of Human-Computer Interaction, 2nd Ed. Free textbooks written by more than 100 leading designers, bestselling authors, and Ivy League professor...

Visit OTK Tech Info for a daily dose of tech-related information. Click the link to stay on top of this industry.

Standard photographic print sizes are used in photographic printing. Cut sheets of paper meant for printing photographs are commonly sold in these sizes.

There have been many standard sizes of paper at different times and in different countries, but today there are two widespread systems in use: the international standard (A4 and its siblings) and the North American sizes.