The guidelines are a comprehensive and practical review of the techniques an organic farmer can use in order to manage weeds in arable systems. The first part deals with the preventive measures that are valid for all crops and in any condition and offers examples of crop rotations, guidance in decision making, description of machinery available (very up-to-date and with precise description of pros and cons of specific pieces of the machinery) and other practical hints. It reports energy consumption, advantages of different choices depending on soil type and weather conditions etc. The second part gathers practical experiences of the implementation and applications, analysing its success and failure factors. Additionally, economic and environmental data per each farm case are available. The approach and the structure allows to assess the potentials to transfer the experiences in other farms, environments and farming systems. Very good pictures and tables allow to identify rapidly the topic of interest.