Are you struggling to find the data that you need to support your business activities? Are you concerned that people may be using the wrong data for their business activities? Are you having difficulty understanding the data that you do find in your data resource? Are you frustrated over documenting that understanding in a manner that is readily accessible to anyone in the organisation? If the answer to any of these questions is Yes, then you need to read Data Resource Guide to help identify, understand, access, and use the appropriate data. Most public and private sector organisations today have no formal, single location for the complete documentation of their data resource that is readily available to everyone in the organisation. Many organisations do not even have a concept of how to design, develop, or manage a single repository containing an understanding all the data available to the organisation. Yet they are staking their business on those data. Data Resource Data provided the complete data resource model for an organisation’s Data Resource Data. Data Resource Understanding provided a detailed description of how to thoroughly understand an organisation’s data resource through those Data Resource Data. Now, Data Resource Guide provides the detailed specifications for developing a simple, inexpensive, and effective way to document the data resource understanding and make that understanding readily available to anyone in the organisation. Michael Brackett draws on over half a century of data management experience to complete two trilogies for formally managing an organisation’s data as a critical resource. The Data Architecture Trilogy describes the development of a single organisation wide data architecture for an organization. The Data Understanding Trilogy describes the acquisition and documentation of understanding about all the data at an organisation’s disposal.