How to answer: This open-ended question lets you share your breadth of knowledge on computer-aided design (CAD) programs to construct 3D modelling. Ideally, you are well-versed in the CAD program that the company uses and can refer to how you have used it for projects in the past. If you are familiar with more than one, you can discuss the differences and point out the benefits and drawbacks of each program. If you are only familiar with one, refer to your level of specialised knowledge specific to that program.