This document discusses instruments of research, which are the tools used to collect data in an investigation. There are various types of instruments such as tests, questionnaires, interviews, and observation checklists. Proper instrumentation involves carefully selecting the appropriate instrument(s), as well as determining the procedures and conditions for administration. The quality of the data obtained depends on developing instruments that are valid, reliable, objective, and practical. Researchers must also consider who will provide the data - themselves, subjects, informants, documents, or social media - and each source may require a different type of instrument.