Suppose you are dealer in the North seat and draw this hand:
 

ª 3
© K Q J
¨ 6
§ A K 10 9 8 6 4 2
 

You open 1§; partner responds 1ª.  What next?  This hand is difficult to evaluate - you have 13 high-card points and two singletons, so nominally it is worth 13 plus 4 = 17 points.  However there are no wasted honors; furthermore if partner happens to have some clubs, the 8-card club suit will produce additional worth. 
 

A reverse or jump shift could be used to describe this strong hand, but these bids require calling the three-card heart suit; but then you will never be able to convince partner that you have a fist full of clubs.  Some, including me, would be tempted to jump to 3 NT (commonly referred to as a gambling notrump).  I wouldn’t actually do it in this instance, but tempting- yes. 
 

In the real world, this hand was held by my partner Marian and she jumped to 4§, a minor suit jump rebid - very unusual.
 

After I got over the annoyance of having my good spade suit run over, I decided that Marian's hand should contain seven or eight clubs and be worth 19 or 20 points (because if I had a minimum response of 6 points, 4 §clubs would otherwise be too high a contract).  I had a strong hand of 15+ points with five spades and four clubs. 
 

Slam was obvious as was the club suit.  After Blackwood indicated one missing ace, we settled for 6 clubs, Marian making seven for a top board.