Rapid Prototyping
http://www.instructionaldesign.org/models/rapid_prototyping.html

InstructionalDesign.org

Abstract:

The idea of rapid prototyping as it applies to instructional design, is to develop learning experiences in a continual design-evaluation cycle that continues throughout the life of the project. This cycle, known as the spiral cycle or layered approach, is considered to be iterative, meaning that products are continually improved as they cycle continues.