Continuation after an overcall, where next opponent passes or doubles
In principal No trump bids are natural
Simple raises are premeptive
Suits below opponents suit rank are natural and non-forcing
Suits above opponents suit rank, but below our suit rank are transfer bids, later support for overcaller shows the transfer suit and a fit with overcaller
A cuebid is a transfer, as above, or a stop ask for no trump where the cuebid rank is above our suit
A jump shift is a game force

If opponents use a double, for take out or penalties, then the above still applies with the added bid of RDBL which shows 10+ HCPand at most 3 of the overcallers suit

See Appendix E
(1♣) 1♥ (P) or (dbl) 1♠ Natural non-forcing
      1NT Natural 9-11
      2♣ Transfer to ♦, initially weak with ♦ 's but if ♥ 's are subsequently supported shows 5+ ♦ 's and ♥ support (3+ cards) level of support shows strength
      2♦ Transfer to ♥ 's 3+support 10+HCP at worst 8 loser
      2♥ weak raise 3+ support
      2♠ GF natural
      2NT Natural 12-14
         
(1♦ ) 1♥ (P) or (dbl) 1♠ Natural non-forcing
      1NT Natural 9-11
      2♣ Natural non-forcing
      2♦ Transfer to ♥ 's 3+support 10+HCP at worst 8 loser
      2♥ weak raise 3+ support
      2♠ GF natural
      2NT Natural 12-14
         
(1♣) 1♠ (P) or (dbl) 1NT Natural 9-11
      2♣ Transfer to ♦, initially weak with ♦ 's but if ♠ 's are subsequently supported shows 5+ ♦ 's and ♠ support (3+ cards) level of support shows strength
      2♦ Transfer to ♥, initially weak with ♥ 's but if ♠ 's are subsequently supported shows 5+ ♥ 's and ♠ support (3+ cards) level of support shows strength
      2♥ Transfer to ♠ 's 3+support 10+HCP at worst 8 loser
      2♠ weak raise 3+ support
      2NT Natural 12-14
         
(1♦) 1♠ (P) or (dbl) 1NT Natural 9-11
      2♣ Natural non-forcing
      2♦ Transfer to ♥, initially weak with ♥ 's but if ♠ 's are subsequently supported shows 5+ ♥ 's and ♠ support (3+ cards) level of support shows strength
      2♥ Transfer to ♠ 's 3+support 10+HCP at worst 8 loser
      2♠ weak raise 3+ support
      2NT Natural 12-14
         
(1♥) 1♠ (P) or (dbl) 1NT Natural 9-11
      2♣ Natural non-forcing
      2♦ Natural non-forcing
      2♥ Transfer raise 3+support 10+HCP at worst 8 loser
      2♠ weak raise 3+ support
      2NT Natural 12-14
         
(1♥) 2♣ (P) or (dbl) 2♦ Natural non-forcing
      2♥ Stop ask
      2♠ Natural non-forcing
      2NT Natural 12-14
      3♣ weak raise 4+ support
         
(1♥) 2♦ (P) or (dbl) 2♥ Stop ask
      2♠ Natural non-forcing
      2NT Natural 12-14
      3♣ Natural non-forcing
      3♦ weak raise 4+ support
         
(1♠) 2♣ (P) or (dbl) 2♦ Natural non-forcing
      2♥ Natural non-forcing
      2♠ Stop ask
      2NT Natural 12-14
      3♣ weak raise 4+ support
         
(1♠ ) 2♦ (P) or (dbl) 2♥ Natural non-forcing
      2♠ Stop ask
      2NT Natural 12-14
      3♣ Natural non-forcing
      3♦ weak raise 4+ support
         
(1♠ ) 2♥ (P) or (dbl) 2♠ Transfer raise 3+support 10+HCP at worst 8 loser
      2NT Natural 12-14
      3♣ Natural non-forcing
      3♦ Natural non-forcing
      3♥ weak raise 4+ support