JEMTEC

Every organization deals with vast amounts of data which is stored in different formats or patterns developed on different platforms by different developers and further form different database structures. This brings hurdles on the path of analysts or users with respect to its access. Thus, organizations have to write and maintain perhaps hundreds of programs that extract, prepare, and consolidate data for its use. All this process is done with respect to Data Warehouse. Thus ,we can define a data warehouse as “A data warehouse is a subject oriented, integrated, non-volatile and time-variant collection of data in support of management’s decision.” Building of efficient Data Warehouse and its maintenance involves extraction, cleaning and filtering of data etc. It is a costly and time consuming process, as this is performed before requirements are gathere-d. To overcome this problem, we should use such a technique that helps in exploring and clarifying each requirement in deta