How might data be collected for this target response?Include a treatment session checklist in every client binder that lays out in order what the staff should be doing for every session. They should check off each step that gets completed and initial or sign at the end of their session. This would be a self-monitoring/self-management protocol.
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.

Staff incentive systems for completion of checklists
Team meetings using BST to go over what is required of the staff during a session
In vivo-feedback during the session for missed steps
Response-cost intervention for failure to complete required session checklists/behaviors