A compact keyboard lacks the numerical section. The mouse can thus be placed closer to the keyboard. Research shows 90% of users rarely or never use the numerical section. A compact keyboard is more comfortable because it reduces the distance to the mouse (Cook C, et al., 1998). It thus reduces strain on the lower arms and shoulders. Dark letters on a bright background improve legibility (ISO 9241) and contribute to higher productivity (Snyder, 1990).