People, culture & awareness
Small, gentle prompts that make the safe choice the easy one, without forbidding anything.
Formal
Shaping the setting in which people make choices - reminders, sensible default settings, well-timed messages - so the secure option becomes the natural one, while every option stays open.
In plain English
Like painting footsteps on the floor leading to the stairs - nobody is forced, but most people follow them.
In practice
In a municipal job centre, a sticker on every screen reads “Leaving? Windows key + L”, and the mail system shows a yellow banner at the top of every message from outside.
Why it matters
Training is easily forgotten at the moment of choice; a nudge appears right at that moment, so habits change at low cost and without the resistance that new rules meet.