How do I conduct a good survey on


Qualitative vs. quantitative Methods?

The first question to be asked when embarking on research concerns the type of method to be used.  Qualitative methods make it possible to conduct research in fields where knowledge is still quite sparse.  In this case, open-ended questions such as “Why” or “How” are used.

Quantitative methods are used when the field of research is already well known.  In this case, the questionnaire is more prescriptive with single-choice or multiple-choice questions.

Most research is usually referred to as “quali-quantitative”, which means that it is made up of a mixture of open-ended and closed questions.


How do I choose my sample so that it’s representative of the surveyed population?

To be valid, your sample must be made up of a random selection of individuals from the surveyed population.  The number of participants must be sufficient to be representative of the surveyed population.


How many participants do I need to conduct a good survey?

In a qualitative study, five to ten people can be sufficient to conduct a survey.

In a quantitative study, the number of participants is very important because it will determine the accuracy of your results.  The greater the number of participants, the more powerful your test will be, which is necessary in order to detect small effects.

Moreover, the more participants you have, the more you will have results that can be generalised for the surveyed population; in other words, the more “representative” your sample will be.

What is the minimum number of participants for quantitative studies?

For reliable and representative statistical analyses, it has been statistically determined that 30 per group is the minimum number.  If you are studying the effects of a drug on 4 groups, you will therefore need a minimum of 4x30=120 participants to obtain reliable results.


How do I create a good research questionnaire?


Chose one that is short, clear and attractive for the respondents.



Write it clearly and concisely in order to grab the attention of your respondents.  You can talk about the survey (description, time required to complete it, aspects regarding confidentiality) or yourself (name, introduction, contact address).


Thank you Message:

Don’t forget to thank your respondents for sparing you the time to comply with your request.



  • Make it fun and attractive for the respondents.

  • Make it as short and concise as possible to reduce the time required to complete it.

  • Ask short and clear questions.

  • Use simple vocabulary that can be understood easily by your respondents.

  • Avoid asking two questions at the same time: “Do you find this product modern and innovative”.  In this case, ask two questions: “Do you find this product modern?” and “Do you find this product innovative?”.

  • Ask demographic questions (gender, age, salary, etc.) at the end of your questionnaire.

  • Finally, re-read each question once more and ask yourself whether it make