This standard is based on ISPM No. 11, «Pest risk analysis for quarantine pests, including an analysis of environmental risks and risks posed by living modified organisms». It provides detailed instructions for the following stages of pest risk analysis (PRA) for quarantine pests: preparatory stage, pest categorization, assessment of the likelihood of introduction, assessment of potential economic consequences and assessment of pest risk management. It contains a framework, based on successive questions, to decide whether an organism has the characteristics of a quarantine pest and to determine, if necessary, possible management options.