Previous bidding:

no 4♥, no 4♠

4♥, can have 4♠

4♠ no 4♥

any strength

any strength

any strength

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15-17 HCP (3.75-4.25 HT)

balanced hand
4333, 4432, 5♣332, 5♦332

Go to all standard openings

4♥, 4♠ or both or 5♠4♥ or 5♥4♠

8+ HCP (2+ HT)

Stayman convention

asks for 4-card Major (♥, ♠)
answers are artificial - see next

Stayman - detailed description

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Stayman

"The Stayman" convention is used to find the Major fits.

It asks partner to bid his
4-card Major (♥/♠). 

Partner is obliged to show his/her 4♥ or 4♠ by bidding the suit on the second level or bid 2 diamonds without 4♥/4♠. 

The responder can bid the final contract in the second round or describe the distribution further. 

The responder should always have at least one 4-card Major so the further bidding is based on logic. He/she tries to find a 4-4 fit or potentially a 5-3 fit if the responder has both Major suits.