Nelson-Gray and Farmer argue that behavioral assessment and functional anal
ysis may be beneficially applied to personality disorders (PDs). While this
is a reasonable response to the largely non-behaviorally derived Diagnosti
c and Statistical Manual (DSM), it is not yet clear that grafting such theo
retically incongruent elements will be viable. In essence, they argue that
a syndromal classification system could serve a nomothetic role of guiding
a functional, idiographic analysis. This is possible, but it seems unlikely
that this process would remain in equilibrium, with no interactive effect
of the functional analysis on the syndromes themselves. Yet the DSM system
has shown itself to be surprisingly closed to a more functional approach, s
o the relationship between the DSM and functional analysis is not open in b
oth directions. What is needed is a nomothetic level of analysis that is al
so functionally derived. The primary benefit of functional over syndromal c
ategories is one of treatment utility, a concept that is itself surprisingl
y absent from the authors' otherwise comprehensive discussion of behavioral
assessment. (C) 1999 Elsevier Science Ltd. All rights reserved.