5.5 Data collection methods
5.5.1 Postal and other self-completion surveys
In
Chapter 2
, the various advantages of self-completion surveys were discussed.
Assuming that a postal survey has been decided on, consideration needs to be given
to how the survey will be conducted to achieve the best possible response rate. When
sending out questionnaires by post, attention should be paid to:
1. The covering letter
Often, a letter accompanies the questionnaire and aims to get the recipient to
take part in the survey. If possible, the more ‘personal’ this can be the better. An
individual’s name rather than ‘Dear Sir/Madam’ (or, even worse, ‘The
Occupier’) is more likely to catch attention. The letter should introduce the
purpose of the survey and stress the confidentiality of the respondents.
The covering letter should also explain who is sponsoring the research. In my
experience, students explaining that their research is properly supervised and
endorsed by their tutor can achieve high response rates. This is because well-
written covering letters explaining, truthfully, that the project will help with the
student’s educational advancement can go far in appealing to the respondent’s
altruistic sentiments.
2. The questionnaire
As mentioned previously, self-completion surveys may be seen to have the
particular disadvantage that no interviewer is present to explain and prompt.
Thus, the questionnaire layout and presentation require greater consideration
than for surveys where an interviewer conducts the data collection. In this latter
case, interviewers can be trained and can practise using the questionnaire; not so
for respondents on their own. Research has been undertaken to test what types
of format, fonts, colour and length are best. Clearly, the nature of the project
and available budget may determine these factors. The main consideration is
that the questionnaire must be clear, easy to understand and as professionally
laid out and printed as the budget permits.
3. Method of postage
One of the largest costs of postal surveys is the postage – for sending surveys to
respondents and where a posted reply envelope is provided. Pre-paid (freepost)
labels are a satisfactory method as only those returned are chargeable. However,
there is some suggestion (Frankfort-Nachmias and Nachmias, 1996) that such
business-reply envelopes achieve slightly lower response rates than those with a
normal stamp attached.
4. Reminders
After the first distribution of questionnaires, reminders are often required to
boost the response rates. Obviously, extra cost is involved here and sending
reminders requires the researcher to be able to identify which respondents have
not replied. When contemplating this method of data collection, the time
involved in following up late responders should be anticipated as it can lengthen
the whole data collection period. Some researchers include a gift or entry into a
free draw as an inducement to participate. However, care should be taken not to
offend particular respondents who would be willing to take part anyway
because of the value of the survey. Monetary or other inducements perhaps
suggest that a low response rate is already anticipated.
Overall, the various stages involved in the data collection of postal surveys are
as follows:
1. Questionnaire preparation – presentation
– layout
– printing
2. Covering letter – presentation
– layout
– printing
3. Postage preparation – filling envelopes
– addressing
4. First reminder postage – decision whether to include questionnaire and
reply envelope or just letter
5. Subsequent reminders – as necessary within time frame and budget
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