$B$ to minimize material handling between cells.

Using cellular manufacturing terminology, machines $1$ and $3$ are called "bottleneck"

machines since they bind two cells together. When bottleneck conditions exist, as discussed

previously, one can attempt to minimize the disruptive effects of having parts from other cells

intrude on neighboring cells by locating bottleneck machines at the boundary between cells.

Alternatively, the parts that require processing by the bottleneck machines could be reexam$-$

ined to determine if alternative processing approaches can be used. Perhaps parts can be

Figure $3\mathrm{.}31$ Machine$-$part matrix.