We see from Table 10.7 that there is overlap in the data used by all user views. However, the Director and Manager user views and the Supervisor and Assistant user views show more similarities in terms of data requirements. For example, only the Director and Manager user views require data on branches and newspapers whereas only the Supervisor and Assistant user views require data on property viewings. Based on this analysis, we use the centralized approach to first merge the requirements for the Director and Manager user views (given the collective name of Branch user views) and the requirements for the Supervisor and Assistant user views (given the collective name of Staff user views). We