There's research support from Canter et al. to which he did an analysis of 100 murders, assessing 39 different aspects of crimes, e.g. attempt to conceal, cause of death and torture or restraint
There is a subset of features of many serial killers which matched the "organised" profile of the typology and has some validity
Many studies show that the organised-disorganised offender type is not mutually exclusive, as a killer can have multiple contrasting characteristics, e.g. high IQ, but they can leave a spontaneous murder
Several critics (eg Alison 2002) have suggested that this approach is naive and is informed by old-fashioned models of personality that see behaviour as being driven by stable dispositional traits rather than external factors that may be constantly changing
This means the top-down approach, which is based on 'static' models of personality, is likely to have poor validity when it comes to identifying possible suspects and/or trying to predict their next move