Evaluation of Options
=====================

With :doc:`multi-attribute models <DEXiGlosMAMod>`,
:doc:`options <DEXiGlosOpt>` are *evaluated* in the following way:

#. Each option is represented by a vector of basic
   :doc:`attribute <DEXiGlosAttr>` values.
#. The values of each option are aggregated in a bottom-up way according
   to the defined :doc:`structure <DEXiGlosTree>` of the model and
   corresponding :doc:`utility functions <DEXiGlosFunct>`.
#. The overall evaluation of an option is finally obtained as the value
   of one or more root :doc:`attributes <DEXiGlosAttr>` of the model.

On this basis, the decision maker can compare and rank the options, and
possibly identify and select the best one.

In the evaluation, undefined values of basic attributes, denoted '\*',
are interpreted as sets of all possible values that can be assigned to
corresponding attributes. There, DEXi evaluates options trying all these
values and keeps track of the evaluation results in these cases.
Therefore, an evaluation result is not necessarily represented by a
single attribute value, but can also be a *set of values*.

In :doc:`DEXi <DEXi>`, results of option evaluation are shown on its
:doc:`Evaluation Page <DEXiIntTabEval>`, as well as in
:doc:`charts <DEXiIntTabChart>` and :doc:`reports <DEXiIntReport>`.

Example
-------

See the :doc:`evaluation of cars <DEXiCarEval>` using the :doc:`Car
Evaluation <DEXiCar>` model.

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