It's the theory that once someone commits a crime, then everyone thinks about that person and what he use to do in the past. Example: If a man is caught sexually abusing children, then people start thinking "Well, he DID always like to be around children alot..." So its like after the crime happens, then people realize that that persons past acts were clues of what he might do in the future.
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A "Retrospective Study" is a study that has happened in the past wherein the results are used to build a theory or hypothesis of a researcher or scientists.A "Prospective Study" however is a study that has been carried out in recent times. For example, a prospective study would be that of Rahe et al (1970) since it was carried out in the last 30 or so years. An example of a retrospective study would be Hawkins et al (1957).So in essence, a Retrospective Study is one done in the past, whilst a Prospective Study is one done in the present. :)
I think its flashback. Hope this helps
sample is the population we make our study about them.
Differentiate between work study and method study.
The study of coins is called numismatics.