Coated papers and boards must attain certain levels of printing performance interms of print quality, (printability) and machining (runnability). These are the opti-cal properties of gloss, brightness, whiteness and opacity, and the runnability prop-erties of pick resistance, ink receptivity, stiffness and porosity. Whereas customerrequirements control the optical properties, the printing process largely dictatesthose of runnability.