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Stick to the basics for doubles success

Think about these few basic tactical principles for doubles to frustrate and make things difficult for your opponent.

Service accuracy - your serve doesn't have to come down at 100 mph, but can you direct it to the backhand side of your opponent? If so, you may well be guaranteed a weaker return to set your partner up for an easy volley. At club level, the backhand tends to be the weaker shot.
Keep your return and subsequent rallying shots deep and cross-court. This will force your opponent back off the court, encourage a weak reply, and bring your partner at net into the point. We play down the line far too often setting our opponents up with an easy winning volley.
Keep your eyes in front and on your opponents - don't track the ball back to your partner. Your opponents will tell you all you need to know as to what is happening next. This will improve your reaction time especially in quick exchanges.
Before going for the outright winner, test your opponent's net skills. Too often we go for the flashy shot and miss rather than playing the ball low to the net player to force them to volley up - then stick up the lob. It's a great 1-2 combination.
As a server or receiver's partner get involved in the point. Assume an aggressive volleying position closer to the net when your opponent is playing from the baseline and a more defensive position when your partner is playing from the baseline. If you don't touch the ball during a 10 shot rally, you should still be out of breath.

Put these simple principles into practice and you'll find yourself on the winning side more often than not.