“…Further limitations are unique and nonroutine decision environments leading to problems in measuring and assessing new projects (Tatikonda, ), unreliable data for models that are highly sensitive to parameter changes (Chao & Kavadias, ), as well as the strategic nature of decision problems, all of which cause managers to rely on their expertise rather than utilizing elaborate quantitative decision support approaches (Kester, Hultink, & Lauche, ). In his review of empirical and conceptual research in new product portfolio management, Meifort () summarizes that since optimization is rarely used in practice, decision makers play an important role. Various studies highlight that managerial decision making is crucial, for example, studying project portfolios, Jonas, Kock, and Gemünden () provide support for the impact of management quality on portfolio success, conducting interviews, Kester, Griffin, Hultink, and Lauche () conclude that individual's intuition impacts the portfolio selection, and using data from an online simulation exercise with managers, McNally, Durmuşoğlu, and Calantone () summarize that personality traits play an important role for product portfolio decisions.…”