[cloa513]

Here is my thought on double handling for one level bids.

1. The minimum to double is 10-12 HCP with a four card spade and/or 4 card heart suit as appropriate with 11 TP, can bid with 3 of other major with more HCP and of course strong has no limits on suit holding.
2. Responder bids cheapest major bid with 4 and up to 8 HCP, bidding a jump with 8-10 and bids a minor with up to 10 HCP and with no available 4 card major suit and no cover for openers suit and 4/5 cards or even 3 of a minor bid 2 of minor preferring 1S with three cards in spades. With one cover and 8-10 HCP, bid 1NT, with double cover and less than 5 cards of a minor bid 2 NT and with a five card minor and two covers bid 3NT.
3. Responder with 10+ HCP and at preferably at least 4 of the other major or 4/3 of majors, he cues the suit.
3.1 opener bids the cheapest 4 card major with the minimum hand which can be passed.
3.2 opener bids a 4+card minor with 12-14 HCP still possible to have 4 of the major- usually can't have have both free majors see below- cueing again with 22+8421 points and 444 in other suits.
3.3 opener bids 2NT with a half cover or one full cover.
3.4 opener cues the suit with a strong hand and no half cover unless he has a long suit in a major in which can bids that.
3.5 opener cue the suit at the four level with 444 in other suits or more distributional and 19-21 in 8421 points ace=8,king=3,queen=2,jack=1.

Is that clear enough?
Should be clear enough for GIB to handle- he can simulate to choose the level at a high level.