How might data be collected for this target response?Data could be collected trough direct observations or video recording.
Identify several interventions that might help improve response rates. Place them in order with the least-restrictive at the top so that the interventions may be introduced systematically, adding more restrictive / less favorable interventions after the outcomes of less restrictive options have been measured.

I think one of the least restrictive interventions to start with could be a team meeting out lining expectations of professionalism. Reminders could be posted around the center where the staff frequent. Next could be having other staff monitor each other and catch other staff being good and some sort of public reward system. The most intrusive would be directly observing and giving feedback based on a task list.