Firms often keep directories to track information about local counsel, judges, expert witnesses, and more. The most useful of these directories tie the listed individuals to the matters in which they were involved, enabling others in the firm to identify and reach out to lawyers who have prior experience retaining an expert or local counsel, or appearing before a relevant judge. In relation to expert witnesses, directories can also provide links to relevant articles and expertise. Directories can minimize "PTI" - pardon the interruption - emails that are sent to all timekeepers and interrupt work. External directory solutions, such as Courtroom Insight, have built additional value through integrations with docketing and legal research companies, enabling them to provide rich information on a firm's use of related professionals in legal matters.