... a diary or fill in forms regularly to provide information about their attitudes or habits. This method would not be one of the most useful methods that Cadburys could use because peoples attitudes and habits won't help them to develop new products. * Telephone interviews - Although there are many advantages of telephone interviews e.g. saves money because the data is feed straight into the computer no forms to be processed, people don't like being rang at home in there own time. Customers regard this method of research as intrusive. This method would be good for Cadburys because they could select areas etc to get opinions of certain types of people. * Postal interviews - This is a very cheap method of interviewing but very often the response rate is less than 10%. This method would not be very useful to Cadburys because the response rate is not high enough ...

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