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It's well known in all academia of art and design, as well as in the productive institutions, that the evaluation of design is one of the most complicated processes, since being related to the sentiment and variance in needs and cultures from one individual to another, thus the paper is seeking to devise a methodology based on a sensible and rational theory that includes the quantitative measurement and statistical analysis by adopting the concept of Sigma (σ), which goes to calculate the standard deviation (S.) of different criterion to ensure the highest accuracy and less dispersion of results. Accordingly it was possible to specify the research problem in the need to find a usable methodology to be used in assessing design through a set of criteria, which compose the aspects of evaluation, namely: aesthetics, functional, economical and technical criterions. The proposed methodology - in question - can be applied in the following domains: a. The academia which concerned for product design in general, and industrial glass design in particular, where it's useable in selecting the final design/designs. b. In the productive Institutions in general, and glass production institutions in particular; where the need for selecting the final design/ designs to be manufactured, and/or assessing the performance level of the designer/ designers. The research assumes that the use of "Sigma" concept can help in devising a methodology for evaluating the industrial design in general and the industrial glass design in particular, in terms of being more convenient for measuring the different types of evaluation criteria. Eventually the research goes to demonstrate the steps of applying the suggested methodology by conducting the evaluation process of some glass designs. As for the most important results, it was possible to devise the proposed methodology, which based on using the concept of "Sigma" in calculating the standard deviation (S), and the relative standard deviation (RSD) of the different values that represent the evaluation criteria, in addition to set the evaluation form which includes the suggested criteria to be used in the evaluation process, and the magic form where the calculated values can be placed and recorded, eventually the research goes to apply the devised methodology in a case of evaluating some of glass products.
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