Mistakes in OMR sheet design can be problematic as this would lead to errors while reading the OMR sheets, and the results might not be accurate as you desire. With the introduction of OMR sheet designing software though, there are far less chances of making any kinds of errors. However, the mistakes are made while editing the self-designed OMR sheets or the ones downloaded from the Addmen website. Whichever type of OMR sheet you use, here are some mistakes that have to be prevented at all costs.
A sheet that has bubbles and has been made using the DTP software is not an OMR sheet. These bubbles need to be calibrated in the OMR software.
Never add bubbles that are either too big or too small. Bigger bubbles mean more time to fill the entire bubble and small bubbles mean difficulty in filling the bubble properly, as it might stretch to the adjacent bubbles too.
Unequal or improper distance between the bubbles is also another mistake. Equal distance should be maintained both horizontally and vertically.
Never keep the bubbles too close together or too wide apart.
The absence of index points is a huge mistake. They are the most essential elements of an OMR sheet, and their position should not be altered. Ensure that the index points are printed properly without any dust or scratch marks on them.
Do not thicken the edges of the bubbles. The OMR software reads dark marks and thick bubbles mean dark marks, which could be read as answer marks by the OMR software.
Keep the text labels inside the OMR bubbles small.
Unequal or improper distance at the edges of the pages is also a big mistake. There should be enough space around the index points so that the scanning is done properly.
As these OMR sheet design mistakes can hamper the OMR sheet reading process, it is best to avoid them. If you are using the OMR software, make sure that you do not make any changes to the design during the editing stage.