C A P T t

Capacity available in time units in the period t.

D i t

Demand for the item i during the period t.

P T i t

Time required for processing the item i.

S T i

Time required for setting up the production for the item i.

Definition of Variables

X P i t

Number of items i to be produced in the period t.

X I N V i t

Number of items i carried as inventory to be produced during the period t.

X B O i t

Number of item i that will be backordered from the period t.

Y S i t

Binary setup variable.