Table 1.

Glossary of key terms.

User-focused design	A design process that is influenced by the users of the product being designed (Abras et al., 2004).
Participatory design	A design process in which a product's users actively contribute to its design (Johnson, 1998).
Clinical aims	Intervention content that is intended to promote changes in behavior or relevant antecedents of behavior (Mohr et al., 2014).
Usage aims	Intervention features that are intended to increase engagement with the intervention (Mohr et al., 2014).
Human-computer interaction	A field that involves studying how users interact with computer systems (Card et al., 1983).
User experience	A field devoted to understanding what interacting with a product feels like to a user (Rogers et al., 2011).
Persona	Specific representations of potential users intended to personify these characteristics and provide a realistic, detailed model the design team can empathize with.
End goal	A user's specific motivations for engaging with a product (Cooper et al., 2007).
Experience goal	What a user might want to feel when using a product (Cooper et al., 2007).