The phrase "focus of the study" refers to the main topic, subject or area of interest that is being investigated, examined or analyzed in a research project. Full definition
That has been the main focus of my studies all my professional life. (michael-hudson.com)
Because almost 70 percent of its patients are the victims of motor vehicle crashes, automobile safety is a major focus of study at the center. (discovermagazine.com)
A big focus of the study was the «echo effect» of candidate launches, a measure their influence on the overall online discussion. (epolitics.com)