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What simply implies for? consist of ? its purpose in research? Your background experience can play a role in the answer.
to my knowledege research gap is identfication of opportunities that are yet to be explored in a research study. take for example, a research has been carried out about Lean transformation; the gap here entails what has not been critically analysed or future research opportunities. The phrase 'research gap' can be linked to a systematic review or critical review or mapping review/scope in order to find te gap/ opportunity.
It is the difference between what is existed (knowledge = theories, assumptions, practices) and what is required/targeted (or what should be done). Research gap is critical to determine need and necessity of conducting a research. Generally, a research gap can be extension or challenge of the existing variable, theories and assumptions ... etc.