By doing survey based study and following the descriptive analysis of the responses collected. It will suffice for examining the attitude of customers towards electricity theft.
I agree with Akanksha Aggarwal , but the honesty of people in that regards many be insufficient for a scientific study. This is because none will show support to stealing even a thief. I do not currently have specific recommendations for treating that subject.
Dr.Sunita, if you find a reasonable answer to this critical issue, please let me know. In anther situation, a full freedom to choose between right and wrong may be given, then careful supervised investigative approach is conducted for knowing the hidden behaviors. I don't think that these approaches can be used in the considered problem due to the massive population.