Can any one help me to answer these questions from Information systems accounting book?

Maria Reyes Elizabeth Rolison ACCT-451 October15, 2016 Chapter 18 DISCUSSION QUESTIONS 18.1 How would the process of generating a cash disbursements journal from the REA data model presented in Figure 18-4 and Table 18-1 differ from the process for creating a sales journal? 18.2 Why take the time to develop separate REA diagrams for each business cycle if the ultimate objective is to combine them into one integrated enterprise-wide data model? Why not just focus on the integrated model from the start