Responses to 1NT

7NT 7S 7H 7D 7C
         
6NT 6S 6H 6D 6C
         
5NT 5S 5H 5D 5C
         
4NT 4S 4H 4D 4C
         
3NT 3S 3H 3D 3C
  Natural, good 6 card suit, about 4-6 HCP, not 3 cards in the other major. 6+ controls. 5 controls.
2NT 2S 2H 2D 2C
4 controls and 3+ cover cards. 3 controls and 3+ cover cards. 2 controls and 3+ cover cards. 6+ HCP, 0-4 controls. If 2+ controls, less than 3 cover cards. 0-5 HCP. The only response that isn't game forcing.
1NT 1S 1H 1D 1C
Launch Pad. 18-21 HCP, artificial. If unbalanced, 4-5 losers, 5+ controls. If balanced, 19-20 HCP, usually 6 controls.