Page 277 - Design for Six Sigma for Service (Six SIGMA Operational Methods)

246 Chapter Nine

1. Physical contradiction
Methods: Physical contradiction-resolution by using separation
principles.
2. Technical contradiction
Methods: Inventive principles
3. Imperfect functional structures: This problem occurs when
• There are inadequate useful functions or lack of needed useful functions
• There are excessive harmful functions
Methods: Functional improvement methods and TRIZ standard solutions
4. Excessive complexity: This problem occurs when the system is too
complex and costly and some of its functions can be eliminated or
combined.
Methods: Trimming and pruning
5. System improvement: This problem occurs when the current system is
doing its job but enhancement is needed to beat the competition
Method: Evolution of technological systems
6. Develop useful functions: This problem occurs when we can identify
what useful functions are needed to improve the system but we do not
know how to create these functions.
Methods: Physical, chemical, and geometric effects database

9.3.3 Solution Generation

After problem classification, there are usually many TRIZ methods
available for solving the problem, so many alternative solutions could be
found. These solutions will be evaluated in the next step.

9.3.4 Concept Evaluation
There are many concept evaluation methods that can be used to evaluate
and select the best solution. These methods are often not TRIZ-related.
The frequently used concept evaluation methods include Pugh concept
selection, value engineering, and axiomatic design method.

9.4 Technical Contradiction Elimination and Inventive Principles

Genrich Altshuller analyzed more than 40,000 patents and identified about
1250 typical technical contradictions. These contradictions are further
expressed by a matrix of 39 by 39 engineering parameters. To resolve these
contradictions, Altshuller compiled 40 principles. Each of these principles
contains a few subprinciples, totaling up to 86 subprinciples.