The space shuttle design team spent two years working with sketches and models before building the shuttle. Why were these steps important? 1.Sketches and models allowed for the design to be modified before investing huge amounts of time and money to build the actual shuttle.

2.Sketches and models allowed for many different astronauts to provide input on the design of the shuttle before investing money in the actual shuttle.

3.Sketches and models helped astronauts in their training program as they prepared for their missions.