The document gives guidance on basic principles for the ergonomic design of the work environment and the workstation, taking into account lighting effects of noise and mechanical vibrations, electrical and magnetic fields and static electricity, thermal environment, space organization and workplace layout. The document is applicable to the work environment and workstation in those work systems where a visual display terminal (VDT) is used for office work. For the purposes of this part of ISO 9241, the terms and definitions given in ISO 6385, ISO 1996-1, ISO 11690-1 and the following should be applied: e.g. visual adaptation, clothing insulation, colour rendering, flicker, general lighting, glare, illuminance, luminance balance, predicted mean vote (PMV), predicted percentage of dissatisfied (PPD), rating level, reverberation, relative humidity, turbulence intensity.