Usability refers to the ease with which an instrument can be administered, interpreted by the participant, and scored/interpreted by the researcher. Examples are listed below: Researcher-completed Instruments Researchers chose which type of instrument, or instruments, to use based on the research question. Instruments fall into two broad categories, researcher-completed and subject-completed, distinguished by those instruments that researchers administer versus those that are completed by participants. To help distinguish between instrument and instrumentation, consider that the instrument is the device and instrumentation is the course of action (the process of developing, testing, and using the device). Instrument is the general term that researchers use for a measurement device (survey, test, questionnaire, etc.).
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