The assembly line is ubiquitous to manufacturing, rightfully considered one the greatest innovations of the 20th century. But its roots go back farther, past the beginning of the Industrial Revolution, and toward medieval Europe. Its evolution transformed the organization of work, opening up numerous and eventually good-paying jobs to unskilled workers. Supervisors and managers were needed to manage the new workflow, and increasingly complex operations needed even more skills to keep production moving: engineering, accounting, research and development, marketing, human resources, and more. Take this quiz to see what you know about the evolution of the assembly line.