Questionnaire and schedule, both are the methods for primary data collection. and I am unable to clarify the difference between them, i.e. when we should call questionnaire or scheduled while preparing a set of questions to respondents.
A schedule occurs in the specialized sense of a group, or sequence, of questions designed to elicit information upon a subject. Usually, it is completed by an investigator on the basis of information supplied by the particular member of the population chosen for inclusion in the sample, but sometimes it is completed by that member him- or herself, as in postal enquiries.(difference)
whereas questionnaire is a group or sequence of questions designed to elicit information upon a subject, or sequence of subjects, from an informant.
check this link https://stats.oecd.org/glossary/detail.asp?ID=3837
I think of "interview schedule" and "interview questionnaire" as synonyms. But if someone want you to choose one or the other, questionnaire is the widely used term.
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