To predict human behavior, it is best to supplement your intuitive opinions with information derived in what fashion?

Answer: Systematic study

Explanation:

Systematic study is the knowledge and information that is extracted from step by step technique in orderly manner. This field consist of facts and scientific content for studying any behavioral pattern. Systematic study is based on methods, research, observation etc.

According to the question, systematic study should also be considered as an addition to the instinctive ideas about human. It will provide knowledge and accuracy about the idea through methodical knowledge.