EDIT: It depends on where you live. In North America you should ALWAYS tip even if you think you received poor service (just tip less, like 5% rather than 15-20%). Your waitress/waiter is getting paid LESS per hour than the normal minimum wage, because the governement assumes they will be getting tipped. In some places, your server will be making as little as $2/hour. Additionally, they will have to "tip out" approximately 4% of their total sales to the kitchen, hostess/hosts, bartenders and support staff. So essentially they have to PAY to wait on your table, whether you tip them or not. So I emplore you to always tip SOMETHING, even if it is just a little.
Elsewhere (Europe, Australia, etc):
it depends on what type of service you get. if she makes a good effort to look after your table and you feel happy with the service, then yes you definitely should tip the waitress. even if its only something small, to me, the fact that my customers are happy enough to leave a tip means more than the money itself. on the other hand if she is rude, unfriendly and appears to be making no effort at all, then it would be hard to enjoy the meal so you should only tip if you are happy with the service.
About 20% of your meal.
* No the waiter/waitress should never ask for a tip. It is up to the patron to decide if the waiter/waitress deserves a tip for good service. In some higher end restaurants tips (gratuities) are included in the price of your bill.
10% of how much you spend
Absolutely. The waitress should tip the busser, bartender, wine steward, and food runner. Sometimes the hostess. If the busser only buses tables then you should tip them 10% if they do more than buss tables for you then you should tip 20% of your tips. You should tip the bartender 10% of your alcohol sales. You should tip the wine steward or wine sommelier 5% of your wine sales. You should tip the food runner 1% to 1.5% of your food sales. tipping the hostess is not always required. But, if you want the hostess to give you good tables then I would tip her.
The waitress served the meal efficiently. The patrons left the waitress a good tip.
The usual tip % is 15
server wages are reduced to account for the tips. The average hourly rate is 1/2 minimum wage or around $3.50 an hr. fifteen to twenty percent of your bill is the average tip. An easy way to figure out a decent tip is by taking the first number and doubling it. So if the bill is $46 you would leave $8 and that would be just about twenty percent
She doesnt
by adding up the people's bills and by seeing what percent tip the waitress gets...being a waitress is a good job.
No, not really. I've never really noticed, but if you have a really good waiter or waitress then, generally, you should tip. :)
It is illegal for an employer or manager to count and get waitress' tip money. If the employer or manager collects these, employee can sue employer for theft.
Whatever tip you feel is appropriate to the service you have received during your time in her establishment. Tipping someone for good service shouldn't have a fixed levy - it should be at the discretion of the customer !