There are a number of reasons
PSST and PMT might be worth combining. To begin with, the
treatments are conceptually complementary. PSST focuses on
the individual child and the cognitive-behavioral repertoires he
or she brings to diverse interpersonal situations; PMT focuses
on child-rearing practices, parent-child interactions, and contingencies
that can support prosocial behavior at home and at
school. The concurrent focus on cognitive processes of the
child, parent-child interaction, and external contingencies to
support prosocial child behavior might act in concert and surpass
the impact of either PSST or PMT alone.