PHASE 2 Codes and data for caluculation are separated Data are independent -Data are shared in terms of data files Program 1 Data file 1 File management Program 2 system Data file 2 Program n Data file n PHASE 2 8 – Codes and data for caluculation are separated – Data are independent – Data are shared in terms of data files Data file１ … File management system Data file n Program１ Program２ Program n … Data file 2