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Theory of Constraints Presented By Upma Joshi Mohd.Arish
TOC - History ,[object Object],Increase in Computer Power Tremendous effort in line balancing More balanced => more problems Dr. Eli Goldratt showed: How to perfectly balance line That a perfectly balanced line led to bankruptcy Led to development of Theory of Constraints
Theory of constraints ,[object Object]
The title helps in achieving more of its goal by a very small number of constraints, and that there is always at least one constraints.,[object Object]
A constraint is anything that limits a system’s performance, relative to the system goal,[object Object],[object Object]
Operating expense
inventory ,[object Object]
Constraints A constraint is anything that prevents the system from achieving more of its goal. There are many ways that constraints can show up, but a core principle within TOC is that there are not tens or hundreds of constraints. There is at least one and at most a few in any given system. Constraints can be internal or external to the system.
Types of Constraints:
Fundamental Principlesof the Theory Of Constraints… ,[object Object],[object Object]
Improving the Process using TOC Principles… Identify the Constraint ,[object Object],For example, in the example on slide 10, suppose the sales department was only selling the product output at the rate of 3 per hour.
Exploit the Constraint ,[object Object]
For example, in many operationsall processes are shut down during lunchtime or during breaks.
If aprocess is a constraint, the operation should consider rotating lunch periodsso that the constraint is never allowed to be idle. ,[object Object],[object Object]
In that case the emphasis shifts to the new process constraint.
It is also possible that a sales-related change in the product mix will cause a different process to become the constraint. ,[object Object]
1. Identify And How To Exploit The System Constraint 2. Subordinate The Constraint 3. Elevate The System Constraint
Buffers  ,[object Object]
Buffers are placed before the key constraint, thus ensuring that the constraint is never starved. Buffers used in this way protect the constraint and should allow for normal variation of processing time and the occasional upset  before the constraint.,[object Object]
Component 1 is processed from raw material and then assembled with component 2 after it is processed from raw materialafter that Processing Operation is start in component 3,[object Object]
Multiple-time Buffers… ,[object Object]
The final product is then shipped to the customer.
The constraint in the system is located in the middle of the processing for component 1. ,[object Object]
Nothingshould, therefore, impede the progress of component 1.
The problem could arise, however, that component 1 will arrive at the Assembly 1 area before component 2 because of some problem with component 2. ,[object Object]
Multiple-time Buffers… ,[object Object]
The subassembly fromcomponents 1 and 2 have constraint time invested, so we would not want themwaiting for component 3.
This calls for another assembly time buffer to begenerated at the Assembly 2 area.
Unfortunately, the need for buffers has not been fulfilled.,[object Object]
Multiple-time Buffers…
PLANT TYPES T Plant

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Theory of constraints