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Written by Jeffrey T. Luftig, Ph.D.
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Page 4 of 10 Table I illustrates some common calculational components and potential process owners for the elements of the basic TAU model. This table is not intended to serve as a complete and comprehensive presentation of how the model should be deployed in all companies and conditions. Rather, it is intended to provide the reader with a basic and straightforward example of how the TAU model has been successfully and usefully structured in a number of companies with whom the author has worked.
| TAU Component | Level I Sub-component | Level II Sub-component
| Level III Sub-component (where applicable) | Potential Process Owner(s)
| | Availability | Planned downtime
| Preventive maintenance / Sanitation
| | - Maintenance department
- Sanitation crew
| Lunches and breaks
| | Unplanned downtime
| Failure and repair | Product-related | - Product engineering
- Process engineering
- Operations management
| | Process related | No demand
| Lack of sales
| | Choose not to sell
| | No supply | Internal (upstream) unit
| - Operations planning / scheduling
| External supplier
| - Operations scheduling
- Procurement /purchasing
| Choose not to run
| | | - Operations management
- Sales and marketing
| Duty cycle
| Set-ups
| Type/Model change - same product
| | - Operations management
- Sales and marketing
| Product change
| Changeovers
| Label change - same package
| | - Sales and marketing
- Operations planning / scheduling
| Package change
| Efficiency
| Actual within product manufactured | | | - Process engineering
- Operations management
| Product/process selection effect1
| | | - Sales and marketing
- Operations planning / scheduling
| | Yield (Recovery) | Acceptable unit count | (Count maintained by product type / model by customer) | - Operations management
- Process engineering
- Product engineering
| Unacceptable unit count
| In-process / within unit
| | | End-of-line | Shipped and returned
| 1 A function of how efficiency must be calculated for TAU purposes.
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BPE 
