Can someone give me some information about 3 level short suit responses to 1NT opening bids. Particularly, what, if any, are the differences between the 3M bids and the 3m bids. Secondly, what hand shapes are permitted, I presume 4441 and 5440 but if 5431 shapes are allowed how are these managed/restricted. And I would be delighted if somebody could summarise the advantages and disadvantages of this method. Thanks in advance. Big T's