text: It is often required to optimize several glass properties simultaneously, including production costs.
   This can be performed, e.g., by simplex search, or in a spreadsheet as follows:
  # Listing of the desired properties;
  # Entering of models for the reliable calculation of properties based on the glass composition, including a formula for estimating the production costs;
  # Calculation of the squares of the differences (errors) between desired and calculated properties;
  # Reduction of the sum of square errors using the Solver option in Microsoft Excel with the glass components as variables. Other software (e.g. Microcal Origin) can also be used to perform these optimizations.
  It is possible to weight the desired properties differently. Basic information about the principle can be found in an article by Huff et al. The combination of several glass models together with further relevant technological and financial functions can be used in six sigma optimization.