Most customers that purchase the QAD BI modules invariably want additional information that falls outside of the baseline code of the warehouses. This comprehensive guide to QAD-recommended best practices for BI 3.x customizations helps you get the additional information you need. The QAD BI Data Warehouse Designer tool (DWD) makes it easy to add in additional columns and tables to existing BI modules. Doing so, however, can create difficulties at later points when a bug patch or upgrade is required for tables or modules that have been customized. If patches or upgrades are applied, it is important that any customizations are created in a way that avoids having to redo them.