Table 2.

Themes and tools used to explore the user experiences with digitalized immunization tracking and the key enabling factors

Themes	Tools
	In-depth interviews with vaccinators	Key-informant interviews with district stakeholders
Acceptability and operability of the app	Use of key app features and app operability	Acceptability of the app within the district health system, enabling factors, and constraining factors
Validity of the app data	Perceptions of and concerns with the data validity	Perceptions of and concerns with the data validity
Use of the app data	Engaging with the app data, enabling factors, and constraining factors	Engaging with the app data, enabling factors, and constraining factors