Wright Williams & Kelly

TECHNICAL ALERT #14
FOR ALL USERS OF TWO COOL® V2.2.2

Sensitivity Analysis and
Currency Exchange Factor


Sensitivity Analysis
The sensitivity analysis calculator in TWO COOL® v2.2.2 for Wafer Fab and for Assembly & Packaging is limited to a maximum of 250 iterations for graphics and calculation efficiency. If the initial value, iteration value, and maximum values are selected such that exactly 250 iterations are required, a plotting error results. The independent variable (on the X Axis) will exceed the desired maximum. However, the COO values are correct for the reported X-axis variable. This is being corrected in Version 2.3.

Users of Version 2.2.2 can avoid this problem by selecting the initial value, iteration value, and maximum values such that less than 250 iterations are required.

Currency Exchange Factor -- 2 Column Model Only
We have identified a data handling error in the 2 Column Model when different Currency Exchange Factors are used in Columns 1 and 2. For Column 2 of the 2 column model, only the "Material/Consumables" and "Maintenance" cost driver inputs are being factored by the Currency Exchange Factor in Column 2. All other inputs are being factored by the Currency Exchange Factor in Column 1. This is being corrected in Version 2.3.

Users of Version 2.2.2 for Wafer Fabrication and Version 2.2.2 for Assembly & Packaging can avoid this problem by using the same Currency Exchange Factor in both Columns 1 and 2 or using the 1 Column Model.

Techalert14-9803


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