Conventional paper EEGs are at first look satisfactory means of recording EEGs. However these have a major drawback , namely these cannot be re-montaged. Every now and then we see findings on the EEG that look suspicious for abnormal electrical activity but they may be on montages that cannot give a clear determination. And depending on which part of the brain the abnormal signal came from, the montage that shows it best may be different. Once a recording is made on paper there is no way to go back in time and change the montage for that page to get a different 'angle of view'. I would compare paper EEGs to a telescope with a fixed focal length which may be good for some purposes but has tremendous limitations when used for anything else. Another good comparison between paper EEG and digital EEG would be to equate it to the difference between a two dimensional drawing and a three dimensional model of a structure. Basically it lets you look at an abnormal or suspicious signal from multiple different 'points of view' so that we know for sure what exactly it means instead of glossing it over as we often times are forced to do with paper EEGs.