Here's some controversy for us to chew on. What are the best methods to handle interference after a Stayman call. In this auction, 2C could have been garbage stayman but only if at least 4 diamonds were held - otherwise it shows an invitational or better hand. How many have real solid agreements in this auction?
My views are these: The nt bidder has limited his hand nicely with his opening bid, hence has no compelling reason to do anything other than pass unless trying to show specific information. A double here should either be responsive with little to nothing in diamonds or penalty with good diamonds. Not sure which is better. Other bids are determined by this first definition.
For a bonus question, try to guess responder's hand.
Winston

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N E S W
P P 1N P
2♣2♦2♥ p
3♦ P 4♣ P
5♣P 5♥ P P
P