There are lots of resources available on the FIRST website, and within the Regional Planning Guides (although the challenge is often finding them
)
Over the years I've collected various "core messages" and responses from FIRST when questions like these arise.
I found this is one. Sorry I don't know where it came from on the site, but it is "official" language.
Is scientific, technology or mathematics expertise required for students to participate in the FIRST Robotics Competition?
FIRST invites students who may not be predisposed to science, math, or technology to participate. In fact, the FRC is designed to inspire, motivate and encourage students to learn basic principles while challenging more experienced students. Since there are critical roles for students in everything from design and building , to computer animation, to fundraising and research, every student can actively participate and benefit.
I also add the words "teamwork" "professionalism" and "problem-solving". And the word "FUN."