Table 1.

Overview of Hypo-METRICS app development phases and activities

Phase	Activities
Phase 1: Defining the problem	Establish working group and liaise with patient advisory committee
	Conduct targeted literature review
	Develop conceptual framework
Phase 2: Hypo-METRICS app: design and development	Establish general principles for design of the Hypo-METRICS app
	Develop items and response options
	Conduct user-testing and debriefing of Hypo-METRICS app content
	Select app platform and design app
Phase 3: Hypo-METRICS app: planning psychometric validation	Design study and key study details
	Develop psychometric analysis plan

Hypo-METRICS, Hypoglycaemia—MEasurement, ThResholds and ImpaCtS.