I agree with akwoo, subject to a huge caveat Giving honest count on a regular basis will, against good players, doom you to a series of bad results But…. Until one learns how to visualize declarer’s hand from the myriad of more subtle clues, having both partners give honest count will, if both pay attention and THINK about what that information is telling the defenders will help. Sort of like training wheels on our first bicycle. Once we’re competent, the training wheels detract from our cycling. So too does giving frequent and honest count detract from our ability to defend well…..once we’ve mastered some of the subtler skills. What are those skills? Paradoxically, once learned, they work better against good players than against bad ones. The bidding. Different auctions leak different information but there’s an entire world of information available to an attentive listener. It’s not merely what they bid…it can also be what they didn’t bid. Declarer play. Good declarers know proper technique. So if a defender also knows that technique then he or she can infer much about the hand. As with the bidding, what declarer did not do is as informative as what he did do. Simple example. Dummy has KQJxxx in a suit, the hand being declared in notrump. Declarer wins an early trick and doesn’t tackle the KQJxxx. Where’s the Ace? Unless you’re looking at it, the smart money says declarer has it….since the normal (but as with most inferences, this isn’t 100%) approach is to establish the suit. So maybe now that you’ve placed those 4 hcp in declarer’s hand, you have a better idea…if only a slightly better informed guess…about whether partner has a useful holding in some other suit.You also ‘know’ that you can’t screw around since declarer will be running that long suit in dummy quite soon. Partner’s carding. While experts generally signal count infrequently (compared to non-experts) they often try to help partner out by their carding. What’s partner telling us? Most experts give suit preference when following suit in trump. Many experts give suit preference when following suit as declarer cashes a long suit. This, of course, requires watching and remembering EVERY card, but that’s a learnable skill. If you think you can’t do it, you haven’t really tried (unless you suffer from some cognitive issue, which is an increasing issue in the aging bridge population). So my advice….if you and partner aren’t yet comfortable drawing inferences and/or giving attitude when following suit then keep giving honest count but make sure that both of you are doing the work required for that to help. Giving count merely because ‘we always give count even though we don’t know why it’s important’ is worse than useless…you’re helping declarer, assuming declarer is better at this than you are, without helping each other at all. Finally, I rarely give count beyond the situation Precision set out…except I think he overlooked an important one. Say declarer has all the rest of the tricks save one. You guard two suits and you need to know, as you come down to one card, which one to keep. Count is essential