This document discusses four phases of innovation: generate ideas, imagine new uses for existing ideas, frame non-industry ideas for your field, and test ideas. It provides examples of how innovators have applied ideas from other fields, such as using designs from nature to improve armor and buildings. The key is generating many ideas, including from novices without experience in the field, and combining ideas in novel ways, like applying wartime technology to civilians. Innovation happens through an iterative process of generating, imagining, framing, and testing ideas.