A Basic screen design is for speed and simplicity at POS, where a minimum of information is captured. This sort of layout might be used for football stadium sales at half time, where speed is the total priority.

A Standard screen design would show customer name and address and the usual clerk information, and might provide comment fields, sales clerk data, and so on.

A Comprehensive screen design might distinguish a Bill To customer from a Ship To customer and could include many other fields appropriate to special orders or layaways or returns, or multiple currencies, tax types and special fields - whatever is useful in that particular store.