Passed Hand Response
Bridge World Standard says:
For example, a simple raise of an opening bid means the same whether responder is a passed hand or not, So after a 1 opening, if responder has 3 Hearts, he should just raise with less than 10 points.
When responder has 3 Hearts and 10+ points, he can bid 1 with 4+ Spades or 2 with 5+ in the suit. A 2/1 bid by an unpassed hand is not forcing if opener made a weak opening bid, but since responder has promised 10+ points, opener will normally bid again.
When responder has bid 1, showing anywhere from a 5+ point hand to 10-12 points, opener should bid again if at all possible simply to keep the opponents from balancing.
Also see The Drury Convention for responding to an opening 1-of-a-major when you are a passed hand.
Most entries in the database can be used whether responder is a passed hand or not.
Bids for which the specs are different for passed and unpassed hands need separate entries for each. For example, a Jacoby 2N response to 1 of a major shows 13+ HCPs if made by an unpassed hand, but shows a balanced hand with 11-12 HCPs if made by a passed hand.
(b) for takeout when
(c) subject to no special agreement when