tier is based on a quantitative analysis and requires a high level of information while tier is a semiquantitative or a qualitative analysis which requires a lower level of information the ebfa approach includes management objectives and attributes indicators and reference points nested risk indices and management status indices its four management objectives are to maintain system sustainability to maintain biodiversity consistent with natural processes and to protect andor restore fish and prey habitats evalutating the ebfa approach kruse et al as shown in figure the attributes for this component include economic production revenue market and employment