The Inclusive Design Group based at the Engineering Design Centre, University of Cambridge (UK) have been working over many years to find ways to demonstrate to product designers how many potential users are excluded from using, and therefore purchasing, their products. They first published the Inclusive Design Toolkit and have continued enhancing this work. Two gadgets to help designers, gloves and glasses, are now available. Using a pack of Post-it Notes as an example Sam Waller demonstrates in the video below how many people will find it impossible to remove the cellophane wrapping. A good case of including people with low vision and/or arthritis is good for everyone and increases market size.