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Adequately considering interactions among IT/IS projects in the process of constructing an IT/IS project portfolio is an important requirement for value-based IT/IS project portfolio selection. A lot of articles already deal with modeling approaches to incorporate such interactions, but the literature lacks a common terminology and a structured perspective on the manifold types of interactions and their effects. When applied in business practice, this may lead to a systematically wrong project portfolio selection. Based on a comprehensive literature review, our contributions are (1) an identification of relevant classification dimensions of IT/IS project portfolio selection,(2) the development of a framework that provides a structured perspective on deterministic, intratemporal interactions, and–as the main contribution–(3) a unification of the terminology and the semantics of interactions among IT/IS projects. This work shall …