
- Design: an idea or concept that solves the problem
- Build: turn the concept into a real world prototype
- Test: try out the prototype and see if it works
Then after you test it, you go back and re-design it to make it better, and repeat the process.

Okay, I got it...
You then go through the Design, Build, Test cycle.. well mostly Build / Test cycle.. and when you are done, you reach Maintain. This is the process of supporting and maintaining your solution. This allows other people to use your solution or parts of your solution.
Resources
PBS: Design Squad Nation
The Design Process in Action
http://pbskids.org/designsquad/parentseducators/workshop/process.html
James Dyson Foundation (James Dyson is a British inventor, industrial design, and founder of the Dyson company. You probably know his name because he invented the Dyson Bagless Vacuum Cleaner which never loses suction.)
http://www.jamesdysonfoundataion.com/resources
Design, Build, Test -- video on James Dyson Foundation
https://vimeo.com/68665257