The engineering aspect of DFSS
In contrast to the DMAIC methodology, the steps in DFSS are not predefined. Each organization or company defines its DFSS uniquely. Customer satisfaction is of utmost priority in DFSS because in order to generate a product or service whose expected Sigma level is at least 4.5 Sigma, the needs of the customers (CTOs) must be completely studied and understood before product design.
We can state that DFSS has an engineering background because it involves the generation of new processes and products in contrast to DMAIC, where the existing processes are improved to meet the needs of the customer. The five phases of DMADV (or DFSS) are as follows:
Define design or project goals that meet the demands of the customer through voice of the customer (VOC), analysis (external requirements) and business needs (internal requirements).
Measure and identify factors that are Critical To Quality (CTQs), customer needs, potential competitors and risks.
Analyze the design of the process in order to re-design it for meeting the customer needs.
Design the process in such a way that it meets the customer requirements.
Verify the design performance and if the customers' needs are met through the design.
In short, DFSS explores the engineering aspects of the process to be designed; hence, the customer finds a significant increase in the product or service efficiency. In order to attain this, DFSS employs specialized tools such as quality function deployment (QFD), design of experiments (DOE), TRIZ, Taguchi methods, and Robustification, unlike those used in DMAIC.