This Guide provides guidance to writers of European Standards on the needs of micro, small and mediumsized enterprises (SMEs) in order to avoid the exclusion of SMEs from the market and the distortion of fair competition. This Guide is relevant to all involved in standardisation, i.e. standard writers in Working Groups or Technical Committees as well as members of national mirror committees. Not all principles presented in this guide necessarily have to apply to all standards. Therefore, TCs and WGs are the best place to evaluate if and how to address specific needs of SMEs in their standards.