Rebids by opener on forcing bids of responder.
There are three type of forcing bids, you can get from responder viz.
Jump to 2NT shows 14+pts., min. 3 cards support in opener's suit & asking singleton of opener. On rebid, if opener has got any singleton, he bids his singleton suit, otherwise he bids game in major i.e. 4H/4S, if 11-13 and 3NT if 14-15.
Immidiate next higher suit bid i.e. 1S/1NT by responder is relay bid forcing for one round. On his rebid, opener has to first reply whether he has got 11-13 pts. or 14-15 pts. Bids of immediate next higher suit i.e. 1S/1NT by opener shows 11-13 pts., irrespective of dist. whereas any other normal bid i.e 1NT/2C/2D/2H/2S/2NT/3C shows 14-15 pts. and next 4 cards suit, bal. or original suit 6 cards.(Note:- Jump reply shows original suit 6 cards and second suit 5 cards.)
Jump shift bid i.e. 2S/3C/3D/3H/3S is splinter bid showing min. 4 cards support with one honour and bid suit singleton which is min. game force.(Note:- Double jump shift bid shows void). On rebid if opener has no wasted values, he bids his singleton, if any, or take over control by 4NT. If wasted values then he bids game in the major i.e. 4H/4S.