@ Stable Schedule
ANSWER: FOR JIT TO BE SUCCESSFUL, WORK MUST FLOW SMOOTHLY WITH MINIMAL PERTURBATION FROM NORMAL OPERATIONS. PERTURBATIONS REQUIRE CHANGES IN OPERATING PROCEDURES-INCREASES AND DECREASES IN PRODUCTION RATE, UNSCHEDULED SETUPS, VARIATIONS FROM THE REGULAR WORK ROUTINE, AND OTHER EXCEPTIONS. PERTURBATIONS IN DOWNSTREAM OPERATIONS (i.e. FINAL ASSEMBLY) TEND TO BE AMPLIFIED IN UPSTREAM OPERATIONS (i.e. PARTS FEEDING) A MASTER PRODUCTION SCHEDULE THAT REMAINS RELATIVELY CONSTANT OVER TIME IS ONE WAY OF ACHIEVING SMOOTH WORK FLOW AND MINIMIZING DISTURBANCES AND CHANGES IN PRODUCTION.
(REF: FUNDAMENTALS OF MODERN MANUFACTURING, GROOVER M. P., JOHN WILEY & SONS 2007, PAGE 965)
@ Production and Inventory Control (PIC)
ANSWER: A COMPUTER BASED PIC SYSTEM IS DESIGNED TO OPTIMIZE THE RESOURCES OF THE COMPANY (i.e. THE FINANCIAL RESOURCES, THE MATERIALS, THE WORK LOADS) FOR A GIVEN REQUIRED VOLUME OF PRODUCTION. IT TAKES INTO ACCOUNT THE PLANNING OF THE RESOURCES REQUIRED FOR THE PRODUCTION PROCESS AND THE MONITORS THE WAY IT IS CARRIED OUT. IT INCLUDES A VAST RANGE OF FUNCTIONS, FROM THE ELABORATION OF MANUFACTURING PROGRAMMES TO THE MONITORING OF WORKSHOP OPERATIONS AND COVERS ALL THE COORDINATING ACTIVITIES SUCH AS THE DEFINITION OF THE PRODUCT STRUCTURES (TECHNICAL DATABASE OF THE BILLS OF MATERIALS AND MANUFACTURING SCHEDULES), STOCK CONTROL, MRP CALCULATIONS, PURCHASING, WORKSHOP SCHEDULING etc.
(REF: PRINCIPLES OF CIM, JEAN-BAPTISTE WALDNER, WILEY 1992, PAGE 162)
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