It it generally accepted in the international field of risk assessment research that the effects of transgenic organisms have to be assessed ‘case by case‘ and ‘step by step‘. While most physiological effects can be studied in laboratory and greenhouse, ecological, agronomic and economic effects are partly only assessable in field tests or commercial growing and by modelling. Information on these aspects have been retrieved by literature and internet mining and by contacting experts, inter alia, by mailing a questionnaire as included in the appendix of  this document. The study is subdivided into the four sections ‘Scope and area of application’, ‘Changes in weed susceptibility’, ‘Impacts on agricultural practice and agronomy’ and  ‘Impacts on Biodiversity’.