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A protocol is a document that describes the objective(s), design, methodology, statistical considerations, and organization of a trial. The protocol usually also gives the background and rationale for the trial, but these could be provided in other protocol referenced documents.
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Clinical study is any investigation in human subjects intended to discover or verify the clinical, pharmacological and/or other pharmacodynamic effects of an investigational product(s), and/or to identify any adverse reactions to an investigational product(s), and/or to study absorption, distribution, metabolism, and excretion of an investigational product(s) with the object of ascertaining its safety and/or efficacy. The terms clinical trial and clinical study are synonymous.
Research means a systematic investigation, including research development, testing and evaluation, designed to develop or contribute to generalizable knowledge.
For a primary research, data does not exist at the beginning of the study and a researcher has to collect the data using appropriate methods.
An observational study involve interventions on the part of the investigator and its data is descriptive.
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