Optical mark recognition (OMR) is a technology that senses the presence or absence of marks, like pencil marks, made by humans on document forms such as surveys and tests. An OMR device uses light shone onto the form to detect marked areas that reflect less light than unmarked areas. One common application is using OMR to read and score answer sheets for multiple choice exams. The first OMR systems were developed in the 1930s and commercialized by IBM in 1962. Today, OMR is used for a variety of applications including exams, surveys, inspections, screening, feedback, and research studies.