Figure 134. Pie chart comparing size of segments
d. Flow Charts. You would use these charts when presenting the
progressive steps of a process or operation because they clearly present
each step of an operation. There are two different types of flow
charts: logic symbol and illustrative (figures 135 and 136).
(1) Types of flow charts. A logic symbol flow chart uses standard
logic symbols or simple shapes, never both, to represent the steps in
the flow chart. An illustrative flow uses pictures to present the steps
in the flow chart. You should not mix the elements of the two types of
(2) Preparing a flow chart (rough draft). When preparing a flow
chart, the steps of the process usually start at the top lefthand side
and moves left to right as well as top to bottom. If for any reason the
flow does not follow that path, you must use arrowheads to show the
direction and starting point of the process.
The primary flow lines are always heavier (darker) than the symbol
lines. You also must use uniform symbols throughout the chart. That
is, if you use one type symbol for a decision point, then use that
symbol for all decision points in the flow chart.