$14\mathrm{.}3$ The demand for subassembly S is $100$ units in week $7.$

Each unit of S requires $1$ unit of T and $2$ units of U$.$ Each unit of

T requires $1$ unit of V$,2$ units of W$,$ and $1$ unit of X$.$ Finally, each

unit of U requires $2$ units of Y and $3$ units of Z$.$ One firm manufactures all items. It takes $2$ weeks to make S$,1$ week to make T$,$

$2$ weeks to make U$,2$ weeks to make V$,3$ weeks to make W$,1$ week

to make X$,2$ weeks to make Y$,$ and $1$ week to make Z$.$

K$(1)$

L$(4)$ M$(2)$

J

$*$ Note: PX means the problem may be solved with POM for Windows

and$/$or Excel OM$.$ Many of the exercises in this chapter $(14\mathrm{.}1$ through $14\mathrm{.}16$

and $14\mathrm{.}23$ through $14\mathrm{.}27)$ can be done on Resource Manager for Excel, a

commercial system made available by User Solutions, Inc. Access to a trial

version of the software and a set of notes for the user is available at

www$.$usersolutions.com.

a$)$ Construct a product structure. Identify all levels, parents, and

components.

b$)$ Prepare a time$-$phased product structure.