Where collecting data from different sources usually presents many
challenges, because different departments will use different styles of record keeping, different conventions, different time
periods, different degrees of data aggregation, different primary keys, and will have different kinds of error. So the data
must be assembled, integrated in to one unified file which is (Microsoft Access file) in our system to be ready for
importing in to the C# environment for other data pre-processing techniques like resolving inconsistency and reduction