Method of optimizing queue times in a production cycle

1. A method of analyzing production cycle queue time to optimize process steps, the method comprising using a computer in:

selecting a plurality of process steps for a production cycle;

calculating queue times for each of the plurality of process steps in a semiconductor fabrication process operation;

statistically analyzing the queue times to determine a correlation between queue times and at least one of process yield and quality;

generating at least one visual output illustrating the statistically analyzed queue times; and

adjusting a parameter of the process steps to reduce the queue times.

2. The method of claim 1 , wherein statistically analyzing the queue times includes analyzing the queue times with a general linear statistical model.

3. The method of claim 1 , wherein statistically analyzing the queue times includes analyzing the queue times with an analysis of variance model, said analysis of variance model generating a p-value.

4. The method of claim 3 , wherein the visual output is based on the p-value.

5. The method of claim 1 , wherein analyzing the queue times includes a single step method, said single step method analyzing queue times for individual ones of each of the plurality of process steps.

6. The method of claim 1 , wherein analyzing the queue times includes a multiple step method, said multiple step method sequentially analyzing queue times for select ones of the plurality of process steps, said select ones of the plurality of process steps including a selected starting process step and a selected ending process step.

7. The method of claim 1 , wherein analyzing the queue times includes a brute force method, said a brute force method sequentially analyzing queue times for select ones of the plurality of process steps, said select ones of the plurality of process steps including a selected starting process step.

8. The method of claim 1 , wherein analyzing the queue times includes analyzing the queue times to determine correlations to a dependent variable.

9. The method of claim 1 , further comprising: analyzing the visual output to determine a particular queue time to be optimized.

10. A computer program product comprising:

a computer useable storage medium including a computer readable program, wherein the computer readable program when executed on a computer causes the computer to:

calculate queue times for each of a plurality of selected process steps for a production cycle;

statistically analyze the queue times for the selected process steps to determine a correlation between queue times and at least one of process yield and quality;

generate at least one visual output illustrating the statistically analyzed queue times; and

adjusting a parameter of the process steps to reduce the queue times.

11. The computer program product according to claim 10 , wherein the computer readable program when executed on a computer causes the computer to:

statistically analyze the queue times with a general linear statistical model.

12. The computer program product according to claim 10 , wherein the computer readable program when executed on a computer causes the computer to:

statistically analyze the queue times with an analysis of variance model, said analysis of variance model generating a p-value.

13. The computer program product according to claim 12 , wherein the computer readable program when executed on a computer causes the computer to:

generate the visual output based on the p-value.

14. The computer program product according to claim 10 , wherein the computer readable program when executed on a computer causes the computer to:

analyze the queue times in a single step, said single step including calculating queue times for all of the plurality of process steps.

15. The computer program product according to claim 10 , wherein the computer readable program when executed on a computer causes the computer to:

analyze the queue times in multiple steps, each of the multiple steps including calculating queue times for each of a plurality of selected process steps, said selected process steps including a starting process step and an ending process step.

16. The computer program product according to claim 10 , wherein the computer readable program when executed on a computer causes the computer to:

analyze the queue times by brute force including sequentially analyzing the queues times for the selected process steps, said selected process steps including a starting step.

17. The computer program product according to claim 10 , wherein the computer readable program when executed on a computer causes the computer to:

determine correlations between queue times and a dependent variable; and

quantitatively evaluate a relationship between queue time and one of product yield and product quality.

18. The computer program product according to claim 10 , wherein the computer readable program when executed on a computer causes the computer to:

calculate queue times for a semiconductor fabrication process.

19. The computer program product according to claim 10 , wherein the computer readable program when executed on a computer causes the computer to:

determine at least one of the plurality of process steps of a process cycle to be optimized.