Computer system and method for dynamically assessing the market readiness of a product under development

• US 6,038,517 A
• Filed: 01/03/1997
• Issued: 03/14/2000
• Est. Priority Date: 01/03/1997
• Status: Expired due to Term

• Current Assignee: Teradata US, Inc. (Teradata Corporation)
• Original Assignee: NCR Corporation (NCR Voyix Corporation)
• Inventors: Dobbins, James Gregory, Biehl, Robert G.
• Primary Examiner(s): Stamber, Eric W.
• Application Number:
  US08/778,930
• Time in Patent Office: 1,166 Days
• Field of Search: 702/81, 702/82, 702/84, 364/468.16, 364/468.17, 395/183.14, 705/7, 705/10, 714/38
• US Class Current: 702/82
• CPC Class Codes: G06F 11/008 Reliability or availability analysis

Abstract

A method, system, and program storage device are disclosed for generating with a computer a current confidence level from accumulated runtime and failure data of a product subjected to product reliability testing. The current confidence level may be generated from time to time during testing and prior to verifying the product has met its reliability goal with a sufficient level of confidence to provide a quantified risk assessment of whether the product will ultimately meet this reliability goal. In effect, the preferred embodiments of the invention provide quantitative tools for measuring quality goals. As schedule goals are also quantitative in nature, the decision of whether to release a product in view of scheduling and quality concerns typically becomes more of a data-driven risk assessment decision.

Claims

1. A method of dynamically assessing the market readiness of a product under development as represented by a current confidence level, the method comprising the steps of:

(a) subjecting the product to a product reliability test;

(b) accumulating a runtime for the product during the product reliability test;

(c) accumulating a number of failures for the product during the product reliability test;

(d) storing the accumulated runtime and number of failures on a computer;

(e) at any time during the product reliability test and prior to the product meeting a predetermined reliability goal, generating with the computer a current confidence level from the accumulated runtime and number of failures, wherein the current confidence level is related to a quantified risk assessment of whether the product will ultimately meet the predetermined reliability goal thereby providing a data-driven determination of whether a product should be released prior to completion of the product reliability test; and

(f) halting the product reliability test and releasing the product prior to completion of the product reliability test when indicated by the current confidence level.

2. The method of claim 1, wherein the product is a computer software product, and wherein subjecting the product to the product reliability test includes operating the computer software product under normal operating conditions.

3. The method of claim 2, wherein the runtime and number of failures accumulating steps each include the step of summing data accumulated for multiple copies of the computer software product executing on different computers.

4. The method of claim 1, wherein the runtime and number of failures accumulating steps and the generating step are performed using a spreadsheet software application.

5. The method of claim 1, wherein the generating step generates the current confidence level using the equation:

##EQU6## wherein CL is the current confidence level, r is the accumulated number of failures, t is the accumulated runtime, M is the predetermined reliability goal in units of time over failures, and k is a discrimination ratio.

6. The method of claim 5, wherein the predetermined reliability goal is a mean time before failures value in units of hours per failure.

7. The method of claim 5, further comprising the steps of:

calculating with the computer accept and reject ranges using a sequential probability ratio test;

indicating with the computer a successful product test if the accumulated number of failures at a given time is within the calculated accept range; and

indicating with the computer an unsuccessful product test if the accumulated number of failures at a given time is within the calculated reject range.

8. The method of claim 5, wherein the number of failures accumulating step includes the step of excluding any failures that are not reliability related from the accumulated number of failures.

9. The method of claim 1, further comprising the step of, prior to subjecting the product to the product reliability test, assessing a stability of the product, including the steps of tracking reliability errors on a stability chart, and initiating the product reliability test when reliability errors are in control.

10. The method of claim 1, further comprising the step of, prior to subjecting the product to the product reliability test, selecting the predetermined reliability goal to balance quality and scheduling constraints for the product.

11. A computer-implemented product readiness assessment system for dynamically assessing the market readiness of a product under development as represented by a current confidence level, the system comprising:

(a) a computer;

(b) means, performed by the computer, for accumulating a runtime for the product during a product reliability test performed thereon;

(c) means, performed by the computer, for accumulating a number of failures for the product during the product reliability test;

(d) means, performed by the computer, for storing the accumulated runtime and number of failures;

(e) means, performed by the computer, for generating with the computer a current confidence level from the accumulated runtime and number of failures, during the product reliability test and prior to the product meeting a predetermined reliability goal, wherein the current confidence level is related to a quantified risk assessment of whether the product will ultimately meet the predetermined reliability goal thereby providing a data driven determination of whether a product should be released prior to completion of the product reliability test; and

(f) means, performed by the computer for halting the product reliability test to permit the release of the product prior to completion of the product reliability test when indicated by the current confidence level.

12. The system of claim 11, wherein the product is a computer software product, and wherein the product reliability test comprises operating the computer software product under normal operating conditions.

13. The system of claim 12, wherein the means for accumulating runtime and number of failures each comprise means for summing data from multiple copies of the computer software product executing on different computers.

14. The system of claim 11, wherein the system is implemented in a spreadsheet application.

15. The system of claim 11, wherein the means for generating the current confidence level uses the equation:

##EQU7## wherein CL is the current confidence level, r is the accumulated number of failures, t is the accumulated runtime, M is the predetermined reliability goal in units of time over failures, and k is a discrimination ratio.

16. The system of claim 15, wherein the predetermined reliability goal is a mean time before failures value in units of hours per failure.

17. The system of claim 15, further comprising:

means, performed by the computer, for calculating accept and reject ranges using a sequential probability ratio test;

means, performed by the computer, for indicating a successful product test if the accumulated number of failures at a given time is within the calculated accept range; and

means, performed by the computer, for indicating an unsuccessful product test if the accumulated number of failures at a given time is within the calculated reject range.

18. The system of claim 15, wherein the means for accumulating number of failures excludes any failures that are not reliability related from the accumulated number of failures.

19. A program storage device, readable by a computer and tangibly embodying one or more programs of instructions executable by the computer to perform method steps of dynamically assessing the market readiness of a product under development as represented by a current confidence level, the method comprising the steps of:

(a) accumulating a runtime for the product during a product reliability test performed thereon;

(b) accumulating a number of failures for the product during the product reliability test;

(c) storing the accumulated runtime and number of failures on a computer;

(d) from time to time during the product reliability test and prior to the product meeting a predetermined reliability goal, generating with the computer a current confidence level from the accumulated runtime and number of failures, wherein the current confidence level is related to a quantified risk assessment of whether the product will ultimately meet the predetermined reliability goal, thereby providing a data driven determination of whether a product should be released prior to completion of the product reliability test; and

(f) halting the product reliability test to permit the release of the product prior to completion of the product reliability test when indicated by the current confidence level.

20. The program storage device of claim 19, wherein the current confidence level is provided using the equation:

##EQU8## wherein CL is the current confidence level, r is the accumulated number of failures, t is the accumulated runtime, M is the predetermined reliability goal in units of time over failures, and k is a discrimination ratio.

21. The program storage device of claim 20, wherein the method further comprises the steps of:

calculating with the computer accept and reject ranges using a sequential probability ratio test;

indicating with the computer a successful product test if the accumulated number of failures at a given time is within the calculated accept range; and

indicating with the computer an unsuccessful product test if the accumulated number of failures at a given time is within the calculated reject range.