The first products included the i2 Link Notebook and i2 Case Notebook. The i2 Link Notebook enabled investigators to create entity relationship diagrams (a kind of visual database) allowing raw intelligence – largely textual reports (e.g. witness statements) – to be entered manually, revealing the relationships within the data and enabling data from different sources to be collated and graded. Automatic and manual layouts, and the ability to create, share, search, analyze and crucially print, even extremely large charts (sometimes tens of meters in length), dramatically improved law enforcement's ability to understand and communicate the status of investigations, and to direct and manage the process. The i2 Case Notebook provided similar data entry and visualization of time series data (i.e. laying events out along themes such as people and places), again able to handle very large data sets. Even with variable density timescales, due to the very large number of events uncovered in a large investigation, a single Case Chart could cover several walls in an office, or stretch tens of meters along a corridor. While initially for manual data entry, these tools were then extended with add-on components to allow integration with databases. These database add-ons allowed mapping between a database entities (such as person, place, organization, vehicle, asset, event) and the relationships between entities (such as associate, owns, related) and visual entities used to represent those records on the chart (person icon, place icon etc.). The first such database interface was to
HOLMES 2 (Home Office Large Major Enquiry System), and subsequently many different SQL and even free text data sources. With database integration a query could be entered from within the visual representation of the data, the chart, either using a context menu on the chart background, or on a displayed entity (usually an icon). Query results were delivered directly to the visualization, by adding elements to the chart, and any added entities and links were automatically laid out without disturbing the rest of the chart, for ease of understanding. Investigators could explore a database with an initial search, and then incrementally expand to follow particular lines of thought. For example, by right clicking a person icon, choosing "Expand", and having new entities displayed as icons connected to the queried person, to show relationships drawn directly from the database. Thus revealing associations that would be difficult to spot through a traditional database query UI such as a person record that may or may not include information about known associates, vehicles, assets and so on, related to that person. This removed the need for any contextual knowledge by the investigator to infer likely relationships, and enabled even a new investigator to quickly explore new data or new hypotheses even with very large data sets. The i2 Analyst's Notebook became the name for a packaged solution which included the i2 Link Notebook and i2 Case Notebook. This was part of the
Human Terrain System, a
United States Army program which embeds social scientists with combat brigades. An investigation into fraud in the U.S. Army was reported to have used Analyst's Notebook in 2009. Analyst's Notebook was also used in the Army
Distributed Common Ground System through 2011. Other i2 products included: Analyst's Workstation, iBase, iBase Intellishare, iXv Visualizer, iBridge, iXa Search Service, TextChart, ChartReader and PatternTracer. Its products deal with problems sometimes called "
big data". In September 2011, it was announced that
IBM acquired i2 Limited. The terms were not disclosed, but estimated at around $500 million. At the time, it was estimated to have 350 employees. ==References==