The term 'Draft Classification' refers to a system of categorizing beer according to its alcoholic content. The three abbreviations ALE, ONEA, and ONTAP are all related to this system. ALE stands for 'Alcohol by Volume, ' which is the measure of the amount of alcohol in a given volume of beer. ONEA stands for 'Original Extract, ' which is the measure of the amount of sugar in a given volume of beer. ONTAP stands for 'Original Gravity, ' which is the measure of the density of a given volume of beer. All three of these measurements are used to determine the classification of a beer.