TABLE 5. Interview Feedback on System Usability.

Sub-Theme	Description/Examples
Effectiveness	•Reducing Clinic Lead stress in communicating timely information across the clinic. •Reducing Clinic Lead workload for calculating the expected end-of-day doses. •Enabling the Vaccine Lead to make quicker adjustments with regular patient intake updates. •Reducing end-of-day workload by increasing confidence in earlier vaccine preparation. •Learnability through a user-friendly interface. •Transparency with clinic workflow processes. •Usefulness of timed entries by which user.
Efficiency	•Focused communication on specific values when discussing changes in numbers. •Reducing physical workload to communicate. •Better anticipating end-of-day doses/vials with access to frequent updates on patient numbers. •Real-time communication without having co-located workstations. •Provides access to updated information wherever they are in the clinic.
Satisfaction	•Trusting the calculations. •Trusting that others input accurate data. •Catching mistakes in paper-based tracking because of real-time inputs on the app. •Making the work more enjoyable. •Increasing time capacity to perform other aspects of their role in the clinic, such as medical emergencies or staff/patient questions.