Robust Design Optimization (RDO)

RDO combines methods of design optimization with robustness evaluation. It allows a product improvement with a corresponding quantification and assurance of quality. optiSLang provides techniques for variance-based and reliability-based RDO in compliance to the Taguchi method or Design For Six Sigma (DFSS).

Best Practice

  • Definition of the design space of optimization variables as well as of the robustness space of all scattering variables
  • Initial sensitivity analysis within the design space as well as initial robustness evaluation within the space of scattering variables in order to identify important parameters, optimization potential, initial violation probabilities and safety margins
  • Recommendation of final reliability proof for tasks with a sigma level higher than three


Iterative and simultaneous approaches for:

  • Variance-based RDO - tasks with low sigma level (≤ 2-3sigma)
  • Reliability-based RDO - tasks with high sigma level (≥ 3sigma)

Postprocessing & Visualization

  • Interactive postprocessing adapted to the optimization algorithm
  • Fast investigation of optimization performance using different visualization options
  • Histograms to illustrate scatter of result values
  • Distribution fitting, Sigma values, probability of failure
  • Traffic light plot to check the violation of limit values of critical responses


optiSLang is sold worldwide. A list of our distributors can be found here.

Your contact person

Dr.-Ing. Johannes Will

Fon: +49 (0) 3643 9008-30
Fax: +49 (0) 3643 9008-39

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