This document discusses best practices for designing, distributing, and analyzing questionnaires. It describes the key stages of developing a questionnaire including selecting participants, designing question content and format, pre-testing, and coding responses. Important considerations for question design are outlined such as using clear, unambiguous questions aligned with research objectives. The benefits and drawbacks of open-ended versus closed questions are compared. Common problems with question types are identified. Effective coding of questionnaire responses into a summary sheet and software is explained. Piloting the questionnaire with similar participants to identify issues is strongly recommended.