1st Round Responses to 3 of a Suit

From Simplex

Responding to three of a suit is a little different to one and two of a suit, as the bidding has started high, which has the potential to cause problems for flat hands if you are not careful. Unlike responding to 1-level and 2-level bids, responder should not necessarily bid his longest suit; instead he often bids his cheapest 4+ card suit.

Box R1D	Responding to Three of a Suit (3♣, 3♦, 3♥, 3♠)
Bid	Meaning	Forcing?	Where to next?
Pass	0-2 points.	NF
Double	"I had a bid but RHO has just taken it away."	NF
Raise to 4 of Opener's Suit	4+ card support, no other 4+ card suit, 3-8 points.	NF
New Suit below 3NT	3-13 points, cheapest 4+ card suit.	F
New Suit above 3NT but below 4 of Opener's suit	8-13 HCP and a 5+ card suit.	GF
3NT	5-10 HCP and stoppers in all suits junior to Opener's suit.	NF
4NT Blackwood	13+ points.	F

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