A major consideration is the nature of your sample population. It is very easy to make assumptions about your sample’s levels of access to the internet as well as their skills to use online facilities. Before you decide to design and construct an online questionnaire make sure your sample will have access to it and be comfortable using it. Questionnaires contained within emails may reduce some of these potential drawbacks but asking for return via email removes any anonymity as the respondents’ address will be included in the response. Consider very carefully which type of questionnaire best addresses your needs and the needs of your sample population.