Pre-launch Checklists.

Air Force (USAF, at least) checklists are arranged to go around the
cockpit from left aft, around the front, to the right aft. Makes the
flow of checking items smooth. But the checklist "lists" all the items
(and the position to be confirmed or set). What happens in practice is
you would hold the checklist at the correct page and go through the
items by memory (or listen to them being read by the copilot/WSO).

If done correctly, it will catch all the switches/controls/settings.
If done in a hurry, or totally by memory, or without thinking (easy to
do when you do it every day, sometimes several times a day), it is
surprisingly easy to miss items.

Sometimes, you just have to sit back and look at everything and think
about it for a moment....

Kirk
66