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Research term
Protocol
The study’s plan: its questions, procedures, participation requirements, timing, and information to be collected.
Research term
Randomization
Assignment to study groups by chance, rather than by a participant’s or researcher’s choice.
Research term
Screening
The process of checking whether someone meets a study’s participation requirements. An initial inquiry does not complete this process.
Research term
Study phase
A stage of clinical testing with a particular purpose, such as studying safety or effectiveness. Not every kind of research uses phases.