There are many different methodologies and models for the concept of a project life cycle for software and knowledge engineering applications. These methodologies range from radical, all activities take place in parallel, to conservative, one activity is finished to completion before the next is started. By combining methodologies that come from both ends of this spectrum, a new methodology that contains the best aspects of each can be produced. The structured project life cycle is a methodology that is moderately conservative. The prototyping life cycle is a methodology that is radical. By combining these methodologies a new life cycle called the structured prototype life cycle is produced. This new methodology combines the rigor of the structured approach with the flexibility and quick production of results from prototyping. The new methodology can be considered a, conservatively 7'adical life cycle.