Īnother of DARPA's goals for LifeLog had a predictive function. The high level goal of this data logging was to identify 'preferences, plans, goals, and other markers of intentionality'. This was to include credit card purchases, web sites visited, the content of telephone calls and e-mails sent and received, scans of faxes and postal mail sent and received, instant messages sent and received, books and magazines read, television and radio selections, physical location recorded via wearable GPS sensors, biomedical data captured through wearable sensors. LifeLog aimed to compile a massive electronic database of every activity and relationship a person engages in.

The objective of the LifeLog concept was 'to be able to trace the 'threads' of an individual's life in terms of events, states, and relationships', and it has the ability to 'take in all of a subject's experience, from phone numbers dialed and e-mail messages viewed to every breath taken, step made and place gone'. According to its bid solicitation pamphlet in 2003, it was to be 'an ontology-based (sub)system that captures, stores, and makes accessible the flow of one person's experience in and interactions with the world in order to support a broad spectrum of associates/assistants and other system capabilities'. LifeLog was a project of the Information Processing Techniques Office of the Defense Advanced Research Projects Agency (DARPA) of the U.S.

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