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Time Value Map

Time Value Map is generated by tracking a work item through the process and tracking where it spends its time. Only work that is seen as Value-Added by the customer is plotted above the middle line


Tolerance Range

Tolerance Range is the difference between the Upper Specification Limit and the Lower Specification Limit.



The Six Sigma DMAIC problem solving methodology is accomplished in five phases, or steps:

  1. Define
  2. Measure
  3. Analyze
  4. Improve
  5. Control

Between each phase or step many companies employ a "tollgate" to control the process. Only when the person leading the project has satisfactorily accomplished the previous phase may they pass the tollgate and move to the next phase. Tollgates are usually reviewed by a higher authority, such as the Master Black Belt for a Black Belt, or a Business Quality Council.


Total Observed Variation

Total Observed Variation is the combined variation from all sources, including the process and the measurement system.


Total Probability of Defect

The Total Probability of Defect is equal to the sum of the Probability of Defect above the Upper Spec Limit and the Probability of Defect below the Lower Spec Limit.


Total Quality Management (TQM)

A quality control system which focuses on correcting quality issues before they are passed on for further processing downstream.


Touch Time

The time a product is actually being worked on.

See also Processing Time


Toyota Production System (TPS)

A detailed manufacturing methodology developed at Toyota by Taiichi Ohno and Shigeo Shingo to increase quality, lower cost, decrease defects. The heart of the system focuses on JIT, Level Loading, Customer, 5S, and the 7 Wastes.


TPM (Total Productive Maintenance)

An approach that aims at maximizing equipment effectiveness and reducing downtime due to failures and repairs. This ensures that each machine in a production process is able to perform at its optimal efficiency throughout the lifespan of the equipment, resulting in production never being interrupted.


Traditional Cost Systems

Adds all traceable costs of resources used to unit-level costs. The contribution margin (under Variable Costing) is sales revenue minus all variable cost.

See also Variable Costing


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