Editing Influence diagram (section)

==Example==

[[File:Simple Influence Diagram.svg|thumb|Simple influence diagram for making decision about vacation activity]]

Consider the simple influence diagram representing a situation where a decision-maker is planning their vacation.
:*There is 1 decision node (''Vacation Activity''), 2 uncertainty nodes (''Weather Condition, Weather Forecast''), and 1 value node (''Satisfaction'').
:*There are 2 functional arcs (ending in ''Satisfaction''), 1 conditional arc (ending in ''Weather Forecast''), and 1 informational arc (ending in ''Vacation Activity'').

:*Functional arcs ending in ''Satisfaction'' indicate that ''Satisfaction'' is a utility function of ''Weather Condition'' and ''Vacation Activity''.  In other words, their satisfaction can be quantified if they know what the weather is like and what their choice of activity is.  (Note that they do not value ''Weather Forecast'' directly)
:*Conditional arc ending in ''Weather Forecast'' indicates their belief that ''Weather Forecast'' and ''Weather Condition'' can be dependent.
:*Informational arc ending in ''Vacation Activity'' indicates that they will only know ''Weather Forecast'', not ''Weather Condition'', when making their choice.  In other words, actual weather will be known after they make their choice, and only forecast is what they can count on at this stage.

:*It also follows semantically, for example, that ''Vacation Activity'' is independent on (irrelevant to) ''Weather Condition'' given ''Weather Forecast'' is known.