In this commentary, we critically review the study of Greiff, Stadler, Sonnleitner, Wolff, and Martin, “Sometimes less is more: Comparing the validity of complex problem solving measures” (Intelligence, 2015, 50, 100–113). The main conclusion of Greiff et al. that the “multiple complex systems” (MCS) approach to measuring complex problem-solving ability possesses superior validity compared to c...
