PET: The researcher will also need to have the consent of the respondent to fill out the form, but depending on the questions you might need informed consent to send the survey/questionnaire to them. Sending out things like questionnaires and surveys have more reliability and are easier to measure how replicable, and re-testable a piece of research is. Questionnaires and surveys, especially ones that have open questions are interpretivism as they are interested more in the participants' opinions and feelings rather than the facts.