Mr. Wörz has worked several years on the issues involved with making air travel accessible to passengers that must use wheelchairs. In the process he developed a detailed matrix of customer requirements using the traditional engineering approach. Further study led to a conclusion that sensory perception should be considered as an input to the traditional engineering requirements used in product design. Since that time Mr. Wörz's work has focused on the measurement of the importance of sensory input and incorporation of that information is not the engineering design process.
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Design Principles and Practices
