Page 124 - Orlicky's Material Requirements Planning
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CHAPTER 6 The Material Requirements Planning System 103
FIGURE 6-3
X
Bill of material.
Component
Identity A H N Z
Items
Quantity per 1 1 2 1
FIGURE 6-4
Hierarchy of bills of material.
X
Level 0
A H N Z
Level 1
Level 2 B I P F G P Q R S
Level 3 P M C W J K L T U V W
Level 4 D E
Level 5 E
When the individual BOMs defining a product are linked together graphically, as in
Figure 6-4, they form a hierarchical, pyramid-like structure, and the levels come into
view. By convention the levels are numbered from top to bottom, beginning with level 0
for the end product. The structure may be likened to a Christmas tree, and vertical lines
of progression (such as X-A-B-C-D-E in Figure 6-5) are called branches. The items on the
highest level in a product-structure file are termed end items.
