Gantt charts, because of their success, form the most easy to use and the most widely used scheduling tools. But these charts are also accompanied with some of the limitations like –
1. In such charts, it is very necessary to keep on updating the charts, in order to keep it in current form.
Henry L. Gantt, a very well known American engineer was the one who developed Gantt chart. Gantt chart is very helpful in processes which may include loading, scheduling, dispatching and also progressing. The chart is usually drawn on a ruled or a printed sheet or sometimes it may be drawn in a ruled board. Nowadays a large number of Gantt charts have come into existence but only a few of them are considered to be reliable. The most commonly used Gantt charts from the available list are load chart and the schedule chart.
It can be defined as a series of time intervals specifying the types of order changes that are allowed. Time fences can be categorized as –
1. Demand Time Fence (DTF) – In this type, there is a designated period in which the MPS is frozen. The DTF starts with the present period, extending into the future, with relatively few periods. In demand time fence, freezing the MPS means not allowing any type of changes to the existing schedule.
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Master scheduling is not an easy job to perform as both supply and the demand keep on changing continuously. Changing to a master production schedule can be disruptive and especially the changes in the immediate periods of the schedule are not desirable. MPS is prepared for a period of about 12 weeks – MPS is updated on a rolling basis. The main job of the master scheduler is to continually manage changes and keep schedules in a balanced level. A master scheduler should always be ready to react to a change that may occur incidentally or intentionally.
In MPS, inputs are used to draw a master production schedule and the inputs used are – orders from customers, production plan from aggregate planning, forecast, resources that are available, inventory levels and the capacity constraints. While drawing a MPS, quantities of individual items must be equal to the aggregate quantities from the production plan and also the total requirements for a product must be allocated overtime in a very good manner.
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