When making a decision, multiple criteria are used to evaluate the alternatives. In Tetra these are represented with a    icon. Each criterion has a name, and may have associated properties. Criteria can be organised into a tree-like structure, with main criteria, sub-criteria, sub-sub-criteria and so on. Criteria which have sub-criteria are indicated with a    icon and are referred to as criteria folders.

This section contains a subsection on working with criteria.