Answer:
social indicator research
Step-by-step explanation:
Henley is doing social indicator research
Social indicator research is a journal which deals with measuring the quality of life of society.
In this research, they study the empirical, philosophical and methodological spectrum of the society.
This spectrum of society includes individual, public and private organizations, etc.
here, Professor Henley is examining the number of people arrested in different countries. This study will help to know about the quality of life of the different countries.