Errata: In Figure 1.11, caption refers to "numbers in circles" that are not present in figure
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Location: page 15, line 4
In Figure 1.11, the caption refers to an earlier version of the figure, in which delays where shown for the information and material flows. The sentence "The numbers in the circles represent the delays in the ﬂow of information or materials" should be deleted.
(Contributed by J. Amelang, 5 Oct 09)