The objection to the game of Auction which makes it the subject of the most severe criticism is the possibility that improper information may be conveyed to the partner by the manner of making the bid.
After starting to bid, by using the word "one" or "two" there should never be any hesitation, as that tells the partner that there is more than one call under consideration. The same comment applies to hesitation when it is evident to the partner that it must be caused by a doubt whether or not to double, and the opportunity so to do still remains with him. An extended delay in passing or bidding one Spade also conveys an obvious suggestion. It goes without saying that no honorable partner would avail himself of such information. Being the unwilling recipient of it, however, places him in an awkward position, as he must cross-examine himself as to whether any questionable bid or double he contemplates is in any way encouraged by it. If he have even a scintilla of doubt, he must pass.
A few principles of bidding applicable to all conditions may be stated at the beginning of the consideration of the subject.
Adopt informatory and conservative methods.
A good player may bid higher than a poor one.
When your partner fails to assist your bid, do not count on him for more strength than a Dealer who has bid one Spade.
Any overbid of an adversary shows strength; an overbid of a partner who has declared No-trump may show weakness.
Overbidding a partner who has declared Royals or Hearts shows weakness in his suit.
Being without a suit, or holding a singleton, is an element of strength for a Trump declaration; of weakness for a No-trumper.
When, if you do not bid, the adversary will be left in with a declaration with which he cannot make game, do not take him out unless you expect to score game with your declaration.