Expert networks provide a forum for people who need to establish knowledge sharing focused on solving a problem. Expert networks are typically based on peer-to-peer support. These kinds of systems aid geographically distributed organizations. Expert networks often emphasize the importance of acknowledging that most knowledge cannot be made explicit and stored in a computer, but will reside in the brains of experts. Peer-to-peer support is tacit-to-tacit when experts use a chat tool to communicate, but it is tacit-to-explicit when solutions are stored for future use and reference.