Inductive method of psychological profiling
The premise is that if certain crimes committed by different people are similar, then the offenders could have similar personality traits.

Deductive method
This method is slightly different. From a thorough analysis of the crime scene and the evidence left at that scene, the profiler is able to construct a mental picture of the unknown offender. Information about the victim is crucial, for the more one knows about the victim, the more one knows about the offender. In the crime fiction novel Presumed Dead, the investigation employs both methods at different stages.
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