A balancing 1NT bid can be a wide-ranging action, about 11-15/16 points. This 5-point range is much larger than most Notrump bids and leaves partner with a more difficult bidding situation. Range Stayman is a tool that can help Advancer better determine the values of our hand and if game is a possibility.
(545) NT Bidding: Responding to 1NT in Competition - Lebensohl
(541) NT Bidding: DONT and Meckwell
(524) Fits and More: Raising Partner in Competition
One of the most important parts of bridge is raising partner. We try to raise Opener whenever possible. We may choose not to support partner immediately if we feel we have something more pressing to communicate, in which case we can respond in our own Major, use a negative double, or bid some number of notrump, but in general we strive to “support with support.”