Ø Select the Lock tool. Use the right mouse button single click on the variable Work To Do. For the Macintosh, hold the Control key down and click with the mouse button (Ctrl + Click).
An options dialog box will open.
Ø Change the font (e.g., to Arial), the size, color, or anything else, then click OK.
Note that in the options dialog the Word Position option only applies if the variable has a Shape selected (anything but None).
Ø Select menu Edit>Select all or press Ctrl + A. Click on the font size button on the Status Bar at the bottom of the window (probably reads 12) and choose a bigger size, say 14. Click outside of the highlighted box.
Ø Click with the right mouse button on the arrowhead of the arrow from Work To Do to overtime hours required, an options dialog box will open:
As Work To Do increases, overtime hours required also increase, a positive causality.
Ø Select + (under Polarity) and Outside (of the arrow's curve) then click OK.
The polarity (+) is, by default, attached to the head of the arrow inside the curve.
Ø Continue changing the polarity of arrows according to the figure below, selecting Outside of the arrow's curve for each arrow:
Now you will highlight the positive feedback loop with thicker and colored arrows.
Ø Select the Move/Size tool if it is not already selected.
Ø Click once on the arrowhead of the arrow from Work To Do to overtime hours required. Now hold down the Shift key and click on the other arrowheads of arrows from:
· overtime hours required to fatigue
· fatigue to quality of work
· quality of work to Work To Do
This will highlight all the handles and show a dotted box around the perimeter of the selected arrows.
Ø Release the Shift key.
Ø On the Status Bar, look for the button with two arrows of different widths 
. Click on it and choose the fifth line from the top. All arrows highlighted will increase in width.
Ø Click on the color button just to the left of arrow width (probably colored blue) and choose a different color (e.g., red). Now click somewhere on the diagram outside of the dotted box to unselect the arrows.