In knowledge management, a conceptualization can be understood as a certain body of formally defined domain knowledge, which represents the content-related foundation of a specific knowledge base. Conceptualizations suitable for the knowledge management in IT projects have hardly been studied to date. This paper therefore demonstrates how a conceptualization of relevant project knowledge can be developed and used. For this purpose, the study exploits the potential of postproject reviews for the extraction of project knowledge concepts. In total, 271 reports from e-business projects are examined in this process. As a result, a conceptualization of e-business project knowledge is thereby developed. In general, this conceptualization expands the understanding of e-business projects. In particular, it represents the content-related foundation for the subsequent development of an appropriate ontology-based knowledge repository, which contributes to the effective knowledge creation and sharing in such complex undertakings.