Slam Bidding

Slam Bidding involves specialized techniques like cue bidding and key cards asking. While you may have the required strength to bid a slam, you need to ensure that opponents cannot take first two tricks in a suit or if two key cards are missing.  This is achieved through cue bidding and key card asking bids which ensure that you get into slam only when you have the strength and fit and also the required controls.

It has 4 exercise deals explaining the concept.