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What is a Data Warehouse? A data warehouse is a storage and analysis application that allows schools to collect and store student and school data from a number of sources and from multiple years. A data warehouse application allows data to be viewed in a multidimensional manner through numerous filters, slices and attributes. A data warehouse is intended to be an analytical system to view and compare current data with longitudinal data, to identify trends and to help develop educational improvements. A data warehouse does not replace a student information system or finance/HR application.  Rather, a data warehouse brings together key data elements from numerous systems, including assessment results and demographic data, to allow for in-depth analysis and data-driven decision making.