Q: How can I write about the justification of my research – and what does it entail?

Answer:

The justification is also known as the rationale and is written in the Introduction. You may thus refer to these resources for writing the justification of your research:

• How to write the rationale for research?
• Can you give an example of the "rationale of a study"?
• 4 Step approach to writing the Introduction section of a research paper

Hope that helps. All the best for your research!