- Criminology – The study of crime and criminal actions/behavior
- John E. Douglas – American criminal profiler
- Latin phrases
- Modus ponens – Rule of logical inference
- Modus tollens – Rule of logical inference
- Modus vivendi – Arrangement that allows conflicting parties to coexist in peace
- Signature crime – crime which exhibits characteristics unique to an offender's psychology
A modus operandi (often shortened to M.O.) is someone's habits of working, particularly in the context of business or criminal investigations, but also more generally. It is a Latin phrase, approximately translated as "mode (or manner) of operating".[1]
Term
The term is often used in police work when discussing crime and addressing the methods employed by criminals. It is also used in criminal profiling,[2] where it can help in finding clues to the offender's psychology.[3] It largely consists of examining the actions used by the individuals to execute the crime, prevent its detection and facilitate escape.[1] A suspect's modus operandi can assist in their identification, apprehension, or repression, and can also be used to determine links between crimes.[4]
In business, modus operandi is used to describe a firm's preferred means of executing business and interacting with other firms.
Plural
The plural is modi operandi (rather than modi operandorum).[5] The word operandi is a gerund in the genitive case, "of operating"; gerunds can never be pluralised in Latin, as opposed to gerundives. When a noun with an attribute in the genitive is pluralised, only the head noun normally changes, just as in English with "of": "a fact of life, two facts of life" (unlike, for instance, les modes opératoires in French).
See also
https://en.wikipedia.org/wiki/Modus_operandi
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