Independence of information and programs. The program uses the information in each file is associated with the data file directly. If there is a change in the structure of data editing, editing program.
The release of the data and programs. The program uses the data to be correlated with data files directly if there are any changes to the data structures are modified program.
Freedom of information and programs. The program used in each data file to be in relationship with the file directly if modified change data structure's editing program.