An influence chart is a simple diagram that shows what outcome variables the model will generate and how these inputs are calculated from necessary inputs. There are several guidelines to constructing influence charts:
Start with the outcome measure (the variable used to measure the success of a plan of action).
Decompose the outcome measure into a small set of variables that determine it directly.
Take each variable in turn and repeat the process of decomposition.
Identify input data and decisions as they arise.
Make sure each variable appears only once in the diagram.
Highlight special types of elements with consistent symbols.
Symbols of influence charts
Influence charts make use of symbols that distinguish the roles of different types of variables:
Start with the outcome measure (the variable used to measure the success of a plan of action).
Decompose the outcome measure into a small set of variables that determine it directly.
Take each variable in turn and repeat the process of decomposition.
Identify input data and decisions as they arise.
Make sure each variable appears only once in the diagram.
Highlight special types of elements with consistent symbols.
Symbols of influence charts
Influence charts make use of symbols that distinguish the roles of different types of variables:
Hexagon- represents outputs (objective) 
Boxes- represent decisions
Circles- represent other variables
Triangles- represent fixed inputs
Double circles- represent variables that are random
Boxes- represent decisions
Circles- represent other variables
Triangles- represent fixed inputs
Double circles- represent variables that are random
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