Tier 1 is based on a quantitative analysis and requires a high level of information, while Tier 2 is a semi-quantitative 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 and/or restore fish and prey habitats. Evalutating the EBFA approach, Kruse et al. As shown in Figure 3.1, the attributes for this component include economic production, revenue, market and employment.