Thursday, 10 May 2007

The Cyclical Iterative Design Process

The design process was developed after an extensive study of architectural design processes and design processes used in other design related areas such as aviation and industrial design.
The design process consists of 4 stages:

1. (Re)definition of the Specifications and Design Development
2. Production (Model, Mockup, Prototype and Product)
3. Testing / Using
4. Analyzing and Evaluation


The four stages are worked through successively. At the end of each cycle the result is analyzed and evaluated. This serves as an input for the next cycle. The iterative principle is an integral part of the Cyclical Design Process, in which each cycle should lead to an improvement of the quality. Maximum quality in the minimum number of cycles. If after the first cycle the result is analyzed and evaluated and the required quality is not yet reached another cycle is started. At the end of the second cycle, the quality is still not at the required level another cycle is started. This process is repeated until the required quality has been reached. The illustration below shows a case where 4 cycles were needed to arrive to the required quality.


The next graph shows how in each cycle the difference between the required quality and the attained quality becomes smaller and finally reaches zero.

Of course this example shows an ideal situation. In practice such a steady increase of the quality will not be very common. The next item will deal with the iterative aspects in the design of an internet table for a retailer.

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