Primary data is usually unprocessed or raw data. It can be expensive to gather and is usually not comprehensive. It can be very specific and useful but it is not always easy to access. Survey methods include telephone interviews, personal interviews and mail surveys. Telephone surveys have rapid response times, are inexpensive, allow for additional feedback from the respondent and can be made reasonably random.
Personal interviews can be time consuming and expensive but generally return excellent information.
Surveys should be as brief as possible while still gathering the necessary information. Ensure that your questions are clear and unambiguous. Design the questions to prove your hypotheses and answer your outstanding questions. Use a rating scale if an opinion is required. Proof-read your work.