Both sell many identical products, but under a house brand name. As a result, these identical products have different product numbers. Before the databases can be merged, the two lines of products must be merged. Identifying all of the databases within the organization that might be useful also poses a challenge because some of them are stored on an individual's personal computer, rather than on a centralized server. Similarly, some valuable information might be online, but not contained in a database.
Documents are one example.
Many organizations maintain policy and procedures manuals, but save them as word processing files, not in databases. Similarly, visual data, such as product sketches and engineering drawings, are usually saved in graphics files and might not available through a database. Tacit information cannot be included in the inventory. Tacit information includes ideas, brainstorms, thoughts, and unwritten plans for future activities. Some users only store this information in their heads.