which is useful when comparing the desired activity and the actual

activity.

Figure 1-25 shows a cumulative curve chart. The first point plotted is

the number of graduates (50) in June. The second point plotted is the

total number of graduates (100) in July, which represents the total

graduates in June (50) and July (50). Each of the remaining points are

cumulative totals of graduates.

From this chart you can assign

intermediate values. That is if the graduation takes place on almost a

daily basis, you can go to the point on the curve that represents the

date and the scale line that the curve crosses is the number of graduates

(total) to that date.

Figure 1-24.

Broken curve

chart

Figure 1-25.

Cumulative data

line chart

You also can use a cumulative line chart to present consumption of items

by plotting two lines on the chart.

To do this, you would plot the

desired consumption for the time period, and then plot the actual

consumption of the item. At a glance the reader