Final answer:
Leah's treatment including peer modeling, academic tutoring, and family therapy, is known as a multisystemic approach, which addresses various factors influencing conduct disorder.
Step-by-step explanation:
Leah's treatment is a multisystemic approach. This approach integrates strategies that address the multiple factors influencing Leah's conduct disorder. By involving a group of peers to model positive behavior, providing tutoring for academic struggles, and working on improvements in family dynamics through therapy, Leah's treatment plan encompasses a variety of systems in her life.
The multisystemic treatment (MST) approach is comprehensive and looks at the complex interplay between individual, family, peer, school, and larger community systems to support behavioral change.