Table 1.

Activity and input cost categories and description.

Cost categories, subcategories			Description
Fixed costs
	Planning/microplanning			Planning activities for project implementation during the start-up period.
	System development			Resources and inputs to design the Mobile WAChX system and activities to collaborate with a local mobile technology company to obtain SMS text messaging packages for participants.
	Initial training			Expenses for conducting 2 training workshops during the start-up period for all project staff, including development of relevant training materials.
	Sensitization			Stakeholder workshops and activities at facility level.
Variable costs
	Personnel			Value of personnel time
		Service delivery		Activities for delivering the Mobile WAChX intervention, such as recruiting participants, screening and registering participants, and sending SMS text messages to users.
		Personnel supervision and coordination		Meetings to supervise staff and coordinate and monitor implementation of activities at all sites.
	Communication			Resources and inputs to deliver SMS text messages to participants, including data bundles for internet, an online platform for hosting the Mobile WAChX system, airtime cost for phone calls, and SMS text messaging cost.
	Equipment			Investments that last longer than 1 year, including mobile phones, laptops, and furniture.
	Overhead			Clinic collaboration fee and indirect costs.