Successful application of Just-In-Time (JIT) reduces inventory and the wastage that often accompanies high stock levels. The objective of this technique, as the name implies, is to make sure that all materials, resources, operators, and other elements needed for a production process will be available at the necessary location just at the time that they are needed for the process to continue.

A JIT system can be described as a system to produce and deliver finished goods just in time to be sold, sub-assemblies just-in-time to be assembled into finished goods and purchased materials just-in-time to be transformed into fabricated parts. It is essentially a PULL system in which the customer drives (pulls) the system.

Just-In-Time production requires close coordination between suppliers and their customers. In order to meet the demanding timetables of multiple customers, suppliers must know the ability of their production facilities to meet alternate demand scenarios. ProModel simulation allows production planners to evaluate potential combinations of orders and plan for appropriate lead times. Large customers that require JIT deliveries, such as in the auto industry, often use ProModel to help their suppliers coordinate production capacity with their needs.

ProModel is also used by the purchasing organization to smooth production flows, an essential component of a JIT system. The impact of using multi-function workers, standardization, and implementation of a Kanban system can also be simulated with ProModel.

JIT, how it applies to:

Set-up Time
JIT objectives are achieved through several physical system changes or projects. One of them is set-up time reduction and a drive toward smaller lot sizes. JIT focuses on minimizing set-up time and ultimately aims at unit lot sizes. ProModel has a uniquely flexible method for handling set-up times that allows the modeler to quickly assess the impact of set-up time improvement and reduction in lot sizes.

Quality Considerations
Delivery of high quality parts and materials is fundamental to successful implementation of Just-In-Time. The impact of poor quality and of quality improvements can be quickly demonstrated in a simulation model.

Manufacturing Cells
Another common technique often associated with JIT is the grouping of manufacturing equipment dedicated to the production of some part or group of parts. The layout of equipment is planned to minimize the travel distance and inventories between machines. This concept of cellular manufacturing is often modeled to test various layouts for optimal production flow.

Supplier Buyer Co-ordination
Traditionally, the relationships between manufacturers and vendors have been somewhat adversarial. JIT delivery is based on a commitment to serving the timely needs of the buyer and providing advance information to the supplier. Synchronization of supply and mutual support are thus critical factors for the operational success of JIT.

Using ProModel, you can model the scheduling policy changes that will happen when moving to a just-in-time system. Analyzing the model will indicate the factors that you need to consider in making such a transition. In addition, the model will serve as a valuable educational tool in training the workers on the monumental cultural changes that will be required to move to a JIT philosophy. Using the visualization and "what-if" scenario analysis capabilities of ProModel, you can fine-tune your JIT implementation before putting it to work on the shop floor.

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