Table 3.

Investigator-identified Intervention functions targeting identified barriers and facilitators as defined in the Behavioral Change Wheel framework

Intervention Functions	Arranging home visits	Visiting households to screen contacts	Evaluating contacts in clinics
Education	LHWs use their lay understanding of community knowledge gaps and concerns to counsel patients
Training
Persuasion	LHWs establish trust with index patients
	LHWs convince index patients to accept CI
Environmental restructuring		Home visit allows scheduling flexibility	Clinic-staff streamline clinic visits for contacts
Enablement	LHWs give social support to index patients	Home visit provides privacy	Families support contacts physically
	Clinic-staff shift task of visiting home to LHWs	Contacts trust LHWs	Families support contacts emotionally
	CHWs call index patients on mobile phones
Modeling	Former TB patients recount their experiences in referring their contacts
Incentivization	Clinic funds LHW transport fare	Home visit eliminates some clinic visits	Clinic-staff streamline clinic visits for contacts
		Clinic or program pays LHWs for their work
Restriction
Coercion

Abbreviations: LHWs lay health workers, CI contact investigation, TB tuberculosis