Schevchenko O. Agent based methods for thematic information retrieval from the global network.

New methods of users' inquiries maintenance by agents have been developed as well as architecture and algorithms for information agent have been built. The algorithms are designed for creation of thematic documents indexes, their filtration and modification of reference tree by new estimations of documents probability and weights of their terms. A broker's algorithm for routing management and maintenance of inquiries' query, estimation of the delivery cost retrieval results to a user to evaluate their quality and precision of the service rendered have been developed. Due to .NET technology software prototypes have been developed and experimental testing of developed algorithms has been made.