can any one tell me what is the difference between MRP and
MPS?

Answer Posted / mohan r. desai

Master Production Schedule (MPS) :
MPS operates within only one level of the BOM, While MRP
can be utilized throughout all levels of a material’s
BOM. If a MPS is run on a material, the necessary orders
are planned at that level. Dependent requirements (if any)
are placed on the next BOM level down, and then the process
stops.

Main Idea : Master production scheduling (MPS) is a form of
MRP that concentrates planning on the parts or products
that have the great influence on company profits or which
dominate the entire production process by taking critical
resources. These items are marked as ‘A’ parts (MPS items)
and are planned with extra attention. These items are
selected for a separate MPS run that takes place before the
MRP run. The MPS run is conducted without a BOM explosion
so that the MRP controller can ensure that the Master
schedule items (MSI) are correctly planned before the
detailed MRP run takes place.

The master production schedule is a line on the master
schedule grid that reflects the anticipated build schedule
for those items assigned to the master scheduler. The
master scheduler maintains this schedule, and in turn, it
becomes a set of planning numbers that drives material
requirements planning. It represents what the company plans
to produce expressed in specific configurations,
quantities, and dates. The master production schedule is
not a sales item forecast that represents a statement of
demand. The master production schedule must take into
account the forecast, the production plan, and other
important considerations such as backlog, availability of
material, availability of capacity, and management policies
and goals. Syn: master schedule.

Material Requirements Planning (MRP) :
A set of techniques that uses bill of material data,
inventory data, and the master production schedule to
calculate requirements for materials. It makes
recommendations to release replenishment orders for
material. Further, because it is time-phased, it makes
recommendations to reschedule open orders when due dates
and need dates are not in phase. Time-phased MRP begins
with the items listed on the MPS and determines

(1) the quantity of all components and materials required
to fabricate those items and

(2) the date that the components and material are required.
Time-phased MRP is accomplished by exploding the bill of
material, adjusting for inventory quantities on hand or on
order, and offsetting the net requirements by the
appropriate lead times.

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