There are ways you can minimise the chance of an accidental escape of your bird.
When your bird is out of its cage; which should be encouraged as much as possible for their health and wellbeing, have a planned ritual of checking all windows and doors are firmly closed before opening the cage and that ALL family members are aware when your bird is out.
Make sure if you have visitors that you have the notice to knock and wait before entering due to free-flying birds: if you cannot close a door between your bird and the front door, always return the bird to its cage before answering the door.
When transporting your bird make sure you use a specific bird travel cage .. fully metal/wire, with gaps smaller than your birds head and with a lockable door. If you have to use a cage with a removable bottom please strap with string or similar so there is no chance of it falling off and cable tie any doors/feeding openings.
If you take your bird outside in their cage for UV time please always double secure all doors and feeding points, chain and padlock if necessary.
Do not place small cages on tables etc as cats can knock them off.
Take note of their leg band ID number
If you take your bird outside at all uncaged, always use a harness. Do not ever think that they are so bonded with you that they won't fly off in the event of a scare etc, even clipped birds are capable of flight so never take the risk.
Have digital photographs of your bird ready in case your bird does escape so that you can use these for “Lost” posters you can distribute locally.
Cages should be checked daily for wear and locks tested as most birds regardless of size have the ability to undo fixings and break bars/wire
Train recall especially from heights (use stairs for start)