Research Approach is the plan or blue print which explains the steps to be undertaken to gather data, analyse and interpret your findings
The decision on which research approach to adopt is determined by : the philosophical assumption, research design, research methods of data collection analysis and interpretation.
Below are a few resources to help explain the above.
A research paradigm is “the set of common beliefs and agreements shared between scientists about how problems should be understood and addressed” (Kuhn, 1962)
The diagram below explains the above terms and the relationship between them: