KDD is the knowledge-intensive task consisting of complex interactions, protracted over time, between a human and a (large) database, possibly supported by a heterogeneous suite of tools. In this paper, we present a documentation model to structure and organize information necessary to manage a KDD application, based on the premise that documentation is important not only for better managing efforts, resources and results of a KDD project, but also to capture and reuse project and corporate experiences. After discussing the difficulties underlying KDD process and the requirements for management support through documentation, the paper presents the documentation model, and illustrates its use considering a real KDD application