According to Crawford, the concept creation process requires 3 inputs or dimensions—at least two of which are necessary to test a concept. What are these 3 inputs, and how do they relate to each other? Which is most important and should come first if possible? [Warning: Many students miss this question on exams!] Crawford outlines three basic approaches to generating new product concepts in Chs. 4, 5, and 6. List, compare and contrast these three approaches and indicate various methods or techniques for implementing each approach. Explain which approach Crawford believes to be best (“most productive”) and why.