Checkpoints by the consequence of the action

Just do it

12 espresso machines found

Search the catalogue

No side effects. Show the result and move on.
Show and undo

Delivery address changed
~~Storgatan 1~~ → Sveavägen 12
↶ Undo

Edit delivery address

Affects an order. Say what changed and make it easy to go back.
Require confirmation

Confirm purchase
Espresso machineSEK 18,490

TotalSEK 18,490

CancelPay

Complete the payment

The customer sees the items and total, then confirms it themselves.

lowerhigher

Rising stakes for the customer

Three actions an agent can take in a web shop, with different checkpoints depending on the consequence. A catalogue search happens directly. A changed delivery address is shown with an undo button. A payment requires the customer to see the total and confirm the purchase themselves.