OMR

OMR is an acronym for Optical Mark Recognition. You can read more about OMR here.
OMR forms are used for collecting data. Preparation of this type of form involves several critical steps.

Obviously, one needs to thoughtfully determine the kind of data that needs to be gathered and layout the questions in a clear, understandable format. These questions are then sent to the designer to figure out the best way to present these questions in an attractive layout. The designer needs to understand how the OMR scanner reads this information and position the questions and related response bubbles in just the right position on the form to assure that the scanner can accurately read the information. When the form design or layout is approved by the customer, the electronic form is moved to the printing phase. It is critical that the printer also understands the importance of consistent positioning of the printed sheet according to the layout. Below is a grid layout that represents the critical positioning of an OMR form.
As you can see, there are several grid density options to use based on the amount of data required for the form.

The two basic elements of this grid are the timing marks and the response bubbles. The timing marks appear in one column on one edge of the sheet. These rectangular marks are viewed by the scanner as the sheet travels through it. A timing mark determines when to begin and end the viewing of the corresponding row of bubbles and record the results. A typical form can have up to 48 bubbles across the sheet. In order for the scanner to know what bubbles to look at, a file called a scanning definition needs to be created with the scanning software prior to the actual scanning process. This scanning definition tells the scanner which bubble or bubbles in the grid to look at if filled in, record the assigned value. These values or results are then added to an Excel type data file as each form is scanned. When the scanning is finished the results are then tabulated with the use of special reporting software.

If the quality of the original scan form has been compromised by sloppy layout or printing processes, then the scanned data and the tabulated results potentially may not be reliable.

OMR is a great time-saving process in collecting data but can also create a huge headache if not done correctly.