Master Production ScheduleStates requirements for individual end items and options by date and quantityConstrained by and supports the production planDisaggregates the production plan

Relationship to the Production Plan

Objectives of Master SchedulingMaintain desired level of customer serviceMake best use of resourcesKeep inventories at desired level

Inputs to Master Scheduling ProcessProduction planForecastOrders from customersAdditional independent demandInventory levelsCapacity constraints

Steps in Making an MPSMake a preliminary MPSPerform rough-cut capacity planningResolve differences

Lot size = 50 unitsPreliminary MPSPeriod123456Forecast303030303030Projected available300 balance4010204010Master production schedule505050

Rough-Cut Capacity PlanningRough-cut capacity planning checks whether critical resources are available to support the preliminary master scheduleA resource bill shows the time required for individual items on a critical resource

Resolving DifferencesIf required capacity exceeds available capacityCapacity must be increased, orPlan must be altered

The MPSThe MPS is notA sales forecastA wish listA final assembly schedule

The MPS should beThe anticipated build scheduleRealistic and achievable

MPS and Delivery PromisesAs orders are received, they consume available production and/or inventoryAny part of the MPS level not consumed is available-to-promiseMPS Level

On hand = 200 unitsAvailable-to-Promise (ATP)Period123456Customer orders160202060MPS scheduled receipts200200200Available-to- promise40160140200

Planning HorizonThe planning horizon is the amount of time the master schedule extends into the future

This is normally set to cover a minimum of cumulative lead time plus time for lot sizing low-level components and for capacity changes of primary work centersAPICS Dictionary

Planning Horizon

Time Fences and Zones

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