The answer is: Behavior
Behavioral therapies tend to put more focus on how the environment around the patients is affecting their overall behavior.
When observing their patients, behavioral therapists will separate which behaviors that considered to be 'functional' for the patients and which type of behaviors aren't. The non-functional behaviors are what considered to be troubling symptoms.
Rather than giving insights, they will put more focus on eliminating the non-functional behaviors in order to eliminate patients' psychological problems.