Informal Customer Feedback - Is bascially when you ask a customer if everything is alright. and example of this when you have a meal and the waiter say " is everything alright", And then the customers tells the waiter his opionon or what he wants.

Customer Questionnaires - This is basically market research. design a questionair about your business or about your customers for them to fill out. When you get your questionnair back then you take what they have put and listen to what they say.

Customer Comment Cards- You will noramlly find this in a restruant. All it is, is a little card that customers write on after they have finbishe the meal say they like it or disliked it.