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It is a mistake to know whether KBE is greater than CAD or vice versa. One is in the whole sense no bigger than the other, and we argue here that KBE should replace CAD. In certain circumstances, the KBE programming process is more suitable than the interactive application of the CAD platform, given that MDO supports one of the interests of this novel. This chapter is beyond the scope of a general debate about the suitability of one option for the next. The suggestions are as follows:

Where the focus is only on geometry development and manipulation; where considerations such as direct interaction with geometric models are important, graphical rendering and inspection are essential; if uniform, aesthetic, and heuristic design are the guides behind modeling, rather than engineering laws.

When it comes to design purposes, vocabulary is required instead of design results. The programming method of KBE systems offers the best solution in this case. Although CAD systems are committed to better documenting the results of the human design phase, KBE systems are designed to report the design procedure (i.e., the purpose of the design) and not just the results.

 • A language is needed to promote automation while preserving continuity. Whenever the generative model is “played.” The same protocol (i.e., the same rules and logic processes are applied) is constantly repeated with different appropriate inputs regardless of which operator and of how many replays. In some engineering design cases, one of which is the optimization of design, an obstacle to automation is placed in the loop (except process supervision).

 • A vocabulary offers a competitive advantage when it comes to the ease of interaction with external modeling and simulation applications. Usually, both CAD and KBE systems link (to each other and) through standard data interchange formats including IGES and Move. In times of ad hoc interchange files that are dependent on ASCIIs, the most useful approach to dedicated writers and parser production is full-function language programming. Also, the KBE system can detect and largely simplify these processes where the tool to be connected is required by complicated and knowledge-intensive pre-processing operations to schedule the input.

 • Where there is an aesthetic facet of the architecture and details are produced, but at the same time an multidisciplinary research (MDA) and an optimization approach are used in the design and size of a given product, the best possible solution is provided by combined applications of CAD and KBE. In this case, the CAD process geometry would become the KBE application’s feedback. This implementation will support the complex MDA structure and return the material (partially or fully) to the CAD system, where comprehensive work can take place more immersive.

At the end of the day, the heuristic and non-respecting, geometric or non-repeatable, one-off, and repetitive aspects of the design phase coexist and are interlinked: Both CAD and KBE can contribute to this step, which must be the focus of both the creators of CADs and KBE’s smooth integration.