Investigations such as police investigations, intelligence analysis, and investigative journalism involves a number of complex knowledge management tasks. Investigative teams collect, process, and analyze information related to a specific target to create products that can be disseminated to their customers. This paper presents a novel hypertext-based tool that supports a human-centered, target-centric model for investigative teams. The model divides investigative tasks into five overall processes: acquisition, synthesis, sense-making, dissemination, and cooperation. The developed tool provides more comprehensive support for synthesis and sense-making tasks than existing tools.Policing (e.g., [1,10,14]). Many models have been developed over the years, ranging from reactive community and problemoriented policing models to the more proactive intelligence-led and terror-oriented (i.e., political) policing models. These models run in parallel to the traditional law enforcement model characterized by its paramilitary and bureaucratic "command and control" structure, and focus on incident-driven response to calls for service. Police investigations include a variety of tasks like criminal profiling, crime scene analysis, data processing, and storing and sharing of information. Most information produced by police officers is difficult to represent and thus to access and communicate due to its nature. Police knowledge tends to be implicit and experience-based.Counterterrorism (e.g., [7,8,32]). Before 9/11 (2001), investigations were mainly handled by a nations security services, but are now moving towards joint operations with police in what is often referred to as the emerging policing-security nexus. Counterterrorism investigations are, like many of their targets, covert operations. The goal is to transform intelligence from different sources (humans, signals, images, open, etc.) into actionable intelligence products, typically for governments to take proactive measures in order to thwart high risk plots. Due to the