Publisher Summary A project begins with analyzing the purposes assigned to it, delimiting the system it involves, identifying the stakeholders, and formalizing its goal (the phase of reconnaissance); it continues with defining the options for intervention with which the goal might be pursued, and resolving such interventions into actions (the phase of defining actions). The analyst must carry out these activities in collaboration with the stakeholders. An evaluation criterion is an attribute, or a factor, with which the Decision Maker (DM) or a Stakeholder judges the performance of an alternative from the viewpoint of one of his/her interest. It is not always expressed in an operational way—that is, it does not automatically define a procedure for determining how much it is satisfied by a given alternative. For this reason, it is necessary to define an index—that is, a procedure that associates the criterion with a value expressing the degree to which the criterion is satisfied.