Chapter 9
How do I serve somebody at the counter?
The till is built to work without a mouse, because a real queue does not wait for anyone to aim and select — search by name or scan a barcode, and both land the item the same way.
Add as many items as the sale needs, in any order, and the running total updates as you go — there is nothing to confirm separately from taking the payment, because the payment is what finishes the sale. A search matches on more than the exact name, so a customer who only remembers roughly what something is called can usually still be found by it.
Serving fast is not a shortcut, it is the normal shape
The keyboard is not a fallback for when the mouse is inconvenient — it is how the screen is meant to be used all day, every day, by somebody standing at a counter with both hands often full.
What can wait: getting every line exactly right before moving on is not required — a wrong quantity or the wrong item is corrected the same way it was added, right up until the sale is taken, so serving quickly does not mean serving carelessly.