To get the response you want from children, partners and pets, adopt the praise and reward approach.
Compliment your child regularly for good behaviour. It might only be a small point, such as washing hands before a meal, but it stops you criticising a difficult child all the time.
Reward particularly good behaviour. Rewards might involve putting stickers up on charts: the accumulation of 10 stickers might earn, for example, a new book, a small packet of sweets, ten minutes extra staying-up time before bed, or special activities, such as a trip to the cinema or zoo.
Try out this approach with your partner too. If she has agreed to take on an unpleasant chore or to do you a special favour, show your appreciation. Slip a thank-you note under her pillow or into her briefcase, or buy surprise theatre tickets.
Test positive reinforcement on your friends and office colleagues by making them a cup of coffee or simply complimenting them.
Praise and treat your pets when they do what you want (it's a good idea to keep dog biscuits in the house to reward a good dog) as well as reprimanding them for bad behaviour.
Don't forget yourself? If you're having trouble finishing a project or sticking to an exercise programme or diet, promise yourself rewards for goals that you meet, such as a new jacket or jumper, or a dinner out.