[DWM]

Scoring: MP

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Bidding Starts with east. They are vun we are not

1♦ - P - (1NT) - 2♥
(P) - P - (3♦) - P
(P) - 3♥

When should have south got involved in the bidding?

[hrothgar]

I want to make sure that I understand the auction.

1. East was Dealer and opened 1♦.

2. The 5=3=0=5 hand in the Diagram is the South hand...

My suspicion is that most people would consider this hand suitable for an immediate 1♠ overcall of the 1♦ opening.
Those who don't overcall 1♠ probably have some kind of two suited overcall available.

If you decide to pass, then you need to take some action stronger than 3♥ when partner butts in to the auction.

[DWM]

Yea you got it right East opened, the hand shown is south

[Cascade]

I overcall 1♠.

If for some reason I had forgotten to overcall then on the second round I have to take some action. Passing with these cards when partner had come into the auction is a mistake that many beginner and intermediate players make.

Rather than passing it is almost always right to raise an overcall when you have support and more than about 6 hcp (and sometimes it is right to raise with even less).

As Richard says in fact this hand is probably too strong for a simple raise and so I would make a stronger raise. Either jump to 4♥ or cue-bid 3♦ - a cue-raise - showing invitational or better values with a heart fit. Having passed over 1♦ though I imagine that your partner may get the wrong picture of your hand.

[the hog]

South should bid 1S immediately. Agree with Cascade's and Richard's comments.