1.9 Iteration
The loop in Fig. 1-1 emphasizes that the decision-making process involves many iterations. Each pass through the loop improves the amount and the quality of information and data. Eventually a point is reached where final decisions are made regarding the design, production and marketing of the product. The substance that circulates through this flow diagram is information, which may be in the form of reports and conversations and may be both verbal and pictorial. The iterations are accomplished by communication between people, and this communication is interspersed by go-or-no-go decisions