In order to generate some form of A v C equation it is essential that the two sides of the equation are stable enough for a relationship to be established. Therefore much investigative psychology research is devoted to establishing what the salient features are of an offender's crimes and what it is within those features that is consistent enough to form the basis of their characteristics.

It is from these studies that classification schemes are emerging considering, for example, relevant variations between serial killers (which Hodge (in press) relates to the interpersonal role the offender assigns to the victim) and between stalkers (which Hargreaves and Canter (in press) relate to the nature of the prior relationship between stalker and victim). What is emerging from these studies is that styles of interpersonal transaction may well be consistent enough for some inferential models to be built. A distinct subset of offenders has also been identified that have consistent relationships between their residence and where they commit their crimes, also allowing geographical inference models to be developed.

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