“Anchoring and adjustment” and “deltaSpecs” are presented as concepts for modeling design scenarios in which “previous” re-design solutions form the basis for a new design. The “anchor” provides the basis for the redesign and may consist of a collection of previous design solutions (ideas, components, devices and solution principles). It represents the initial solution. The “deltaSpecs” represent the difference between the specifications for the “new” design and the current version of the design solution and guide the adjustment of the anchor toward the final solution. A case study on the design of the Scanning Tunneling Microscope (STM) illustrates the use of these concepts to describe a design development process strategy.

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