NT First.   With a five card minor, a minimum hand and no fit for responders major, rebid the minor only if there is good reason to believe 1 NT shouldn't be the contract. Usually this will occur in hands with 9+ cards in the minors and a singleton major:

All such bidding depends on the distribution among the minor suits, and, to a lesser degree, stoppers in the majors.  Except for a reverse (1 § followed by 2¨'s), this limits openers hand, and responder should choose the contract.

Rebid Table

ª	©	¨	§
2	1	5	5
3	1	5	4	These two hands should rebid in the minors
2	2	4	5	1NT with major suit stoppers, otherwise 2§'s
3	3	5	2	1NT with major suit stoppers, otherwise 2¨'s
2	4	5	2
1	3	5	4	These two should rebid 1 NT over 1 Spade

Subsequent Bidding. Any further bid by responder over 1 NT or a (non-reverse) minor suit rebid indicates a strong hand by responder because opener has limited his hand.  Opener will stretch to bid 1NT in preference to 2 of a minor, even with poor 'stoppers', so responder should be careful about carrying on depending on major suit stoppers from opener.