SernanticOrganizer is a collaborative knowledge management system designed to support distributed NASA projects, including diverse teams of scientists, engineersi and accident investigators. The system provides a customizable, semantically structured information repository that stores work producrs relevant to multiple projects of differing types. SernanlicOrganizer is one of the earliest and largest semantic web applications deployed at NASA to date, and has been used in diverse contexts ranging from the investigation of Space Shuttle Columbia's accident to the search for life on other planets. -4lthough the underlying repository employs a single unified ontolop, access contTo1 and onfor each project team. This paper describes SemanricOrganizer, its customization facilities, and a sampling of its applications. The paper also summarizes some key lessons learned from building and fielding a successful semaniic web application across a wide-ranging set of domains with diverse users.

InvestigationOrganizer (IO) is a collaborative web-based system designed to support the conduct of mishap investigations. IO provides a common repository for a wide range of mishap related information, and allows investigators to make explicit, shared, and meaningful links between evidence, causal models, findings and recommendations. It integrates the functionality of a database, a common document repository, a semantic knowledge network, a rule-based inference engine, and causal modeling and visualization. Thus far, IO has been used to support four mishap investigations within NASA, ranging from a small property damage case to the loss of the Space Shuttle Columbia. This paper describes how the functionality of IO supports mishap investigations and the lessons learned from the experience of supporting two of the NASA mishap investigations: the Columbia Accident Investigation and the CONTOUR Loss Investigation. 12 TABLE OF CONTENTS 1. THE NEED FOR INVESTIGATION SUPPORT TOOLS ........ 1 2. DESCRIPTION OF INVESTIGATIONORGANIZER FUNCTIONALITY.

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