Batting in partnership is an important skill. When two higher-order batsmen (usually these are the side's best batsmen) are together, they are largely free to play to their own styles although "rotating the strike" is encouraged, and communication when calling runs is an important part of any partnership. Opening partnerships are entrusted with seeing off the new ball, later partnerships are largely charged with consolidation, often facing an aging ball, spin bowling and eventually the second new ball.
The concept of batting in partnership becomes even more vital once only one recognised quality batsman remains. His job is then to shepherd the tail-end batsmen, while attempting to eke out as many runs as possible, or simply to survive as long as possible when merely attempting to save the game. This usually involves attempting to minimise risk, by exposing the lesser batsmen to as little bowling as possible. To do this, boundaries and twos are preferred while singles are avoided in the early parts of an over (although this allows the fielding captain to set his field further back into a more defensive position, often tempting the batsman with an easy single) but because the bowling end changes at the end of an over, it is necessary to score a single (or much more rarely, three runs) to counteract this. While a single on the sixth and final ball of the over would be ideal, the field is usually set closer to make this harder, and the batsman may prefer to rotate the strike on the fifth or even fourth ball, hoping that the tail-ender can survive for a delivery or two, rather than risking either having to take a dangerous run on the last ball (with the attendant risk of a run out) or not being able to get a single at all, leaving the tail-ender stranded on strike for the start of the next over (hence allowing up to six balls to be bowled at him).
