Final answer:
The sketches ready to be further defined and analyzed in the design process are known as prototypes, which are crucial for evaluating and refining design concepts.
Step-by-step explanation:
A sketch or a set of sketches that are ready to be further defined and analyzed are called prototypes. In the design process, engineers and designers often start with rough, hand-drawn sketches to explore the strengths and weaknesses of various design concepts. These sketches are an integral step before creating detailed designs and technical drawings. Prototypes can be physical or computer models and are used to evaluate designs, discover flaws, and refine the design before the final production. Finally, the design is developed with specified shapes, dimensions, materials, and fabrication processes, allowing the creation of more refined prototypes and models.