Abstract: Methods, computer systems, computer-storage media, and graphical user interfaces are provided for improving performance of a multi-class classifier. An interactive graphical user interface includes an item representation display area that displays a plurality of item representations corresponding to a plurality of items processed by a multi-class classifier. The classifier's performance can be visualized using bidirectional bar graphs displaying true positives, false positives, and false negatives for each class.

Abstract: The present invention provides methods for using abstractions of people, including dynamic and static groups of people, to enhance the efficiency of the specification and automation of policies for sharing information between users with a “need-to-know.” An instance of the present invention can also provide these users information based on a “time-to-know.” By providing access to information based on group affiliation and properties of the content of the information, the present invention maintains optimal information privacy while minimizing encumbrances to sharing data with appropriate users and even at appropriate times. The present invention can be integrated with other communication technologies to facilitate access to information in a time appropriate manner. Other instances of the present invention employ automated and semi-automated, mixed-initiative techniques, to make information-sharing decisions.