How might data be collected for this target response?I would as the BCBA observe and take data on data collection (consider a partial interval?)and create a data collection system for staff to self-monitor and self-assess their own data collection using ipad recording feedback.
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.

Self-monitoring
Peer monitoring
Group feedback/performance verbally and in chart form posted in staff break room daily/weekly
Individual feedback/performance verbally and in chart form presented to each staff member daily/weekly