Question: 1-	What is cost and benefit analysis? Explain the two different types of costs and two different types of benefits.
2-	Discuss root-cause analysis as a BPA activity. What are the strengths and limitations of this technique?
3-	It is recommended to use hierarchical structure in organizing team members if they are between 8-10. However, going through the hierarchical structure could delay completing tasks!
Discuss how using hierarchical structure in staffing could reduce complexity?
4-	The data flow diagram levels are number 0,1,2 and going to level 3 and beyond is very uncommon. Highlight the differences between the different levels of DFD with one example and why it is uncommon to go beyond level 3 DFD.
| Level | Description | Example | 
|  Level 0   DFD |   |   | 
| Level 1 DFD |   |   | 
|  Level 2   DFD |   |   | 
| Level 3 data flow diagram DFD and so on : | 
 
 
 
5-	List four common mistakes encountered during Data Modelling?