This video provides an introduction to factorial research designs. This video is part of a project at the Univeristy of Amsterdam in which instruction videos were produced to supplement a course in Methodology for the Bachelor's degree program Pedagogical/Educational Sciences. Illustrations in this video originate from other instruction videos produced by Annemarie Zand Scholten. Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)