“…Second, to date two distinct levels of context of a project portfolio have been addressed: On a micro level, the sizes of project portfolios and the interdependencies that exist between single projects (e.g., in terms of resources, time, and personnel) have been acknowledged to influence project portfolio success (Killen & Kjaer, ; Martinsuo & Lehtonen, ; Teller et al, ). On a macro level, the highly dynamic context regarding technologies and markets (Kock, Heising, & Gemünden, ; Sethi & Iqbal, ) has been identified as a challenge in project portfolio management (Korhonen, Laine, & Martinsuo, ). Furthermore, culture has been put forward as one contextual impact factor for project management (Turner et al, ) and project portfolio success (Killen, Hunt, & Kleinschmidt, ; Killen & Kjaer, ).…”