Questionnaires - There are two main types of questionnaire – fixed response and open-ended. Fixed response questionnaires ask a series of questions, but only permit the respondent to answer in a certain way – by for example providing several answers, e.g. a), b) or c). These are called ‘coded answers’. Open-ended questions leave a small amount of space and allow the respondent to fill it in as they please. With the last type of questionnaire, it is harder for the researcher to categorise, or code, all the answers.