"Gray Box" diagram for Widgets & Gadgets
 Parameters:
(Exogenous, Uncontrollable)
Variable Cost per Widget
Selling Price per Widget
Variable Cost per Gadget
Selling Price Per gadget
Hours to assemble one Widget
Hours to assemble one Gadget
Assembly hours available
Hours to Paint one Widget
Hours to Paint one Gadget
Painting Hours Avaliable
Intervening Variables:
(Endogenous)

Contribution to Profit and Overhead per Widget
Contribution to Profit and Overhead per Gadget
Assembly Hours Consumed
Painting Hours Consumed
 

Outcome Variable:
(Endogenous)

Total Contribution to Profit and Overhead

Exogenous Decisions:
(Exogenous, Controllable)
Number of Widgets to produce
Number og Gadgets to produce