A structured guide or checklist that lists questions and provides spaces for answers should be used. Using a form ensures that crucial questions are identified ahead of time, that complete and accurate information is gathered, and that all interviewers

(if there is more than one) glean the same types of data, thereby helping to ensure comparability of results. However, leeway should also be permitted by including some open-ended questions, such as “Is there anything that we didn’t cover with our questions?” LO.1