Incomplete information is also another problem associated with secondary sources of data. Sometimes if information becomes very old in the databases, it is deleted or erased to give room for new and fresh data. Anyone seeking to obtain the deleted information later will end up getting incomplete or insufficient information which has some missing details. Data from secondary sources may also be contradictory and non-uniform. In the fixing of false information to suit user S, contradictions are generated which are not uniform at all. Patching of information is evident in secondary sources and this facilitates the non-uniformity.
