OR Spectrum (ORSP) publishes applied and theoretical articles that contribute to Operations Research as a scientific instrument. Published articles develop and apply quantitative approaches to problem-solving and decision-making on a strategical, tactical, or operational level. The contributions to science and practice are clearly articulated. At least two reviewers assess the quality of published articles. Surveys and empirical papers (including behavioral research) establishing the need for refining quantitative approaches and/or providing support for central assumptions in existing approaches are within the scope.