The calculation and simulation of unknown factors in products using CAD systems.

• A. Finite element analysis (FEA)
• B. CAD
• C. Bottom-up modelling
• D. Assembly drawings

Answer: (A)

Predicting how a product will behave under uncertain loads, temperatures, or material properties is done through a specialized simulation approach integrated with CAD workflows. Finite element analysis breaks the complex geometry into many small elements, assigns materials and boundary conditions, applies loads, and solves the governing equations to reveal how the part responds—giving stresses, deformations, temperatures, and other factors across the whole model. This is precisely what’s needed to understand unknowns in performance before building a physical prototype.

CAD itself is about creating and detailing geometry; it can host analysis data but doesn’t perform the detailed calculations. Bottom-up modelling refers to how the model is assembled from components, not to performing physics-based analysis. Assembly drawings focus on showing how parts fit together, not on simulating behavior under loads.