The Error Index button should be used with care as it could easily be deemed by some students to be nothing more than a catalogue of failings. It is recommended that if you use this button, that you reserve its use for papers by students who are open-minded and confident. Also, please be sure to balance your critique with praise.

On the other hand, you as the instructor may want to use the index to help you get an overall sense of how a student has performed before making your final comments. Once you've seen the index, it is easily deleted.

The Error Index button works by cataloguing hidden codes in each of the (negative) comments and displaying them in a neat and tidy, two- column index at the bottom of the paper.