My clankers are instructed to use "Outside In development" with "red/green TDD" at all times.

They write really good Gherkin features and then work inwards writing unit tests as they go - checking that they fail before implementation so it's actually testing something worthwhile.

And the code they ship is decent quality (not as good as me most of the time - but a LOT better than me when I'm tired or I'm pissed off about something or the work is really boring).