Answer:
True
Step-by-step explanation:
Computer-aided design can be looked at as the use of computers to aid in the creation, modification, analysis, or optimization of a design.
CAD software are basically used to increase the designer's productivity, improve the quality of design, improve communications through documentation, and to create a database for manufacturing.
In this case, Tim and Eric making use of a computer software to aid in their design which also enable provides them with an estimate of how much of each kind of material is needed, and the orderly progression of tasks that need to be completed.
The use of any computer aid to make design better entails the use of CAD. Hence, its true they are using computer aided design.