Page 288 - SAD bookflip
P. 288

FOUR-MODEL APPROACH











              oMany analyst follow a four-model approach


                owhich means they develop (1) a physical model of the current

                  system, (2) a logical model of the current system, (3) a logical

                  model of the new system, and (4) a physical model of the new


                  system



              oBenefits:  it  gives  a  clear  picture  of  current  system  functions

               before make any modification or improvements



              oDisadvantage of the four-model approach is the added time

               and cost







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