System Modelling computer system analysis and design, computer science homework help

Answer the following questions1. Explain why data flow diagramming can be correctly thought of a process of "functional decomposition."2. State an accurate guideline for an analyst performing data flow diagramming on knowing when no additional levels diagramming are needed. In other words, what is an accurate "stopping rule"?3. Explain the nature of the relationship between information requirements determination (IRD) and data flow diagramming.Use two or three page. All questions are about system modelling.