HarnesSYS also provides tools for both designers and quality control personnel to review the logical circuit design and verify that there are no mistakes within the design. Checkers can markup a diagram and highlight specific parts and wires according to user defined criteria such as circuits, bundles, gauge and other properties using marker and style features. These tools can be real time savers for those responsible for checking the design and for maintenance. They provide an automated method to quickly identify outliers and eliminate inadvertent mistakes. Markups are in a separate layer and do not affect the underlying data, so each reviewer can create their own markup.