Procedures

If the function happens at the same time and explains or elaborates on some function in the horizontal chain of functions, it should be placed below the horizontal path function.

If the function happens all the time, such as an aesthetic function, it should be placed above the horizontal path function at the extreme right of the diagram.

If there are specific design objectives to be kept in mind as the FAST diagram is constructed, they should be placed above the basic function and shown as dotted boxes.

Use two vertical, dashed lines - one to the extreme left and one to the extreme right of the diagram. Everything that lies between the two scope lines Is defined as the problem under study. If the value engineering study is to be concentrated in a more limited area, the vertical dashed scope lines should be drawn closer together and should enclose just the functions of interest. These functions will normally include a particular function having high cost or a high cost/worth ratio, together with the really important supporting functions.

Thehigher order function, or desired output, will lie to the immediate left of the left scope line.

The basic function will always lie to the immediate right of the left scope line.

Somewhere in the horizontal line of functions extending to the right in the How direction across the diagram is a particular function which is supplying input, but which is not really a part of the problem being studied. In this case, the right scope line should be drawn to the immediate left of this particular input function.