Optical answer sheet

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An optical answer sheet (or "bubble sheet") is a special type of form used in multiple choice question examinations. Optical mark recognition is used to detect answers. The most well known company in the United States involved with optical answer sheets is Scantron, although certain applications require their own customised system.

Optical answer sheets usually have a set of blank ovals or boxes that correspond to each question, usually on separate sheets of paper. Bar codes may mark the sheet for automatic processing, and each series of ovals filled will return a certain value when read. In this way students' ability can be tested, or identity given.

Most systems accommodate for human error in filling in ovals imprecisely, as long as they do not stray into the other ovals and the oval is almost completely filled.