This document discusses various methods for collecting primary data in field research, including surveys, interviews, observation, focus groups, diaries/registries, and content analysis. Surveys can collect large quantities of quantitative and qualitative data but must be carefully designed to avoid problems of impersonality. Interviews are flexible for collecting specific or in-depth knowledge but require more effort to organize and analyze. Observation allows understanding a context as a whole but the context may change over time. Focus groups combine interview flexibility with participant interaction but are difficult to organize. Diaries/registries provide detailed behavior information. Content analysis is useful for understanding recurring themes in text data. The document advises carefully selecting the most effective primary data collection method for each research purpose.