This document outlines different methods for collecting primary data, including observation, interviews, and questionnaires. It discusses the types, advantages, and disadvantages of each method. Observation can be participative or non-participative. Interviews can be structured or unstructured. Questionnaires can be administered in different ways such as mailing, collective administration, or in public places. Both interviews and questionnaires have advantages like flexibility but also disadvantages such as potential bias or low response rates.