Invited Talk I -- Some Advances in Data-Mining Techniques -- Web Exploration -- Querying Semantically Tagged Documents on the World-Wide Web -- WWW Exploration Queries -- Strategies for Filtering E-mail Messages Combining Content-Based and Sociological Filtering with User-Stereotypes -- Interactive Query Expansion in a Meta-search Engine -- Database Technology -- On the Optimization of Queries containing Regular Path Expressions -- A Database Array Algebra for Spatio-Temporal Data and Beyond -- Dynamic Relationships and Their Propagation and Concurrency Semantics in Object-Oriented Databases -- Tracking Moving Objects Using Database Technology in DOMINO -- OLOG: A Deductive Object Database Language -- Multiplex: A Formal Model for Multidatabases and Its Implementation -- Temporal Active Rules -- Storage, Meta Information, Ontologies, and Software Engineering -- Cost-Effective Jukebox Storage via Hybrid File-Block Caching -- Ontology-Driven Integration of Scientific Repositories -- Global Version Management for a Federated Turbine Design Environment -- From Object-Process Diagrams to a Natural Object-Process Language -- eColabra An Enterprise Collaboration & Reuse Environment -- Invited Talk II -- Workflow Management in the Internet Age -- Agent and Workflow Management Technology -- A Component-based Workflow System with Dynamic Modifications -- A Temporal Reasoning Approach to Model Workflow Activities -- Dynamic Configuration and Enforcement of Access Control for Mobile Components -- Data Warehousing and Mining -- The MyView Project: A Data Warehousing Approach to Personalized Digital Libraries -- Integrating Data Mining with Relational DBMS: A Tightly-Coupled Approach -- Morphological Disambiguation for Hebrew Search Systems.

The Next Generation Information Technologies and Systems (NGITS) wo- shop series is a biannual event held in Israel since 1993. Like its predecessors, NGITS’99 brings together active members of the international research com- nity interested in information technology and knowledge based systems. Many of the base technologies in the traditional areas of database management systems, information retrieval, and resource optimization, are being deployed nowadays in novel systems and applications that ?ourish with the astonishing increase in computational power, storage capacity, communication, and - of course - the advent of the world-wide web. These new fronts, in turn, present an ever gr- ing set of challenges to the technologies, such as data availability, information integrity, and knowledge extraction, fuelling an exciting set of activities. Our workshop clearly re?ects this trend, o?ering a rich sample of the state of the art at the close of the millennium and a glimpse of what is to come in the next one. In response to the call for papers, we received 34 high quality submissions, 22 of which were carefully selected by the Program Committee for presentation at the workshop and inclusion in these proceedings. These include 17 full length papers as well as 5 short papers (that will be accompanied by demonstrations during the workshop). In addition, it is our pleasure to feature two invited talks, given by Professor J. Ullman of Stanford University and IBM Fellow C. Mohan.