This document provides guidance on identifying research gaps for a PhD dissertation literature review. It defines a research gap as an unexplored area that has potential for further study. It recommends identifying a motivating research question, reviewing literature keywords, and analyzing what issues have not been sufficiently addressed. Methods to find gaps include checking journal websites, using digital tools to analyze popular topics, and noting questions that arise while reading literature. Studying questions in-depth and discussing them with advisors can help prevent duplicating existing work and find gaps suitable for an original dissertation topic. Maintaining records of questions and gaps found is also suggested. The document stresses the importance of selecting a gap that genuinely interests the researcher and can be feasibly studied within time and resource