'Spiral curriculum' may be a term that you haven't heard before, but you certainly have learned from such a curriculum in your own student life. This lesson will provide a definition of spiral curriculum as well as some examples of the educational tool in action.
An Instructional Designer should conduct a needs research and analyze the needs of the targeted group. They have to determine whether these needs can be fulfilled by learning; and exactly how. They write they learning objectives and conduct research to see what the outcomes are.
1 This is a good place to start. 2  Don Clark has a great introduction to Instructional Systems Design (ISD) and ADDIE, the most common instructional design model. 3  This is actually the site I used when I was first trying to move into instructional design.