Date Added: Aug 2011
Data warehouse systems integrate data from heterogeneous sources and are used by decision makers to analyze the status and the development of an organization. Due to the sensitive data contain in the DW it is most important to specify a security, from early stages of DW design so that data must be secured. Traditionally, security was not considered as an important element in modeling of DW. Most of the author starts applying a security at conceptual level to implementation level, however they did not consider a "Requirement level" which basically a main levels in DW design.