00257nam a2200133Ia 4500020000900000082000900009100002100018245004800039250000600087260000900093300000900102500000600111650000600117  aNULL  aNULL  aZkiewyez, Hawrgs 0aIntroduction to systems analysis and design  a-  a-b-  aNULL  a0  a-