Criteria are the rules or principles for evaluating the system performance induced by each possible assignment of controllable variables. For a quantitative assessment, criteria are expressed by means of indicators, represented by or computed from system dependent variables. For instance, the income from selling of clams (which depends on the quantity of harvested clams) can be used as an indicator related to an economic criterion. Objectives express the type of optimization to be performed on each indicator in form of either maximization or minimization (e.g., stakeholders aim at maximizing the income from selling of clams).