milamae - Its not all sweetness and lollipops in my house, i show disapproval, my tone of voice changes, stern looks etc, etc.
I know the feeling, trying to cook dinner, phone is ringing, 3 year old is running about like a nutter, climbing on the dog, throwing toys, older boys at bickering, mum tell him. Ive just replaced shouting with something else. I dont ask numerous times, i ask once, then consequence, that way i dont get to boiling point. Now they know they have one chance to comply, instead of 20, very rarely do i have to apply the consequence. Im also consistent, i mean what i say and stick to it.
The more boring everyday things,with my older boys its the computer, ps2 etc doesnt go on until you tidy your room, do your homework etc. With my 3 year old, i try to turn it into a game or kid him along, im going set the timer to 1 minute and lets see if we can get your shoes on before it rings. If he really wont comply, i pick him up sit him down and put them on.
Staying calm also has the added bonus of letting them now im in control of my emotions, not them, so they tend not to do things just to annoy me.
I found it doesnt take any more time, than it does shouting at them, might not work for everyone, but its worked for me.