Table 2.

Excerpt of identified and selected target group preferences for app characteristics and features.

Study 1		Study 2	Target group preferences for app characteristics and features, based on findings from studies 1 and 2	Accept or reject
Topic	Subtopic	Results
Mobile phone and app usage	Mobile phone is used for entertainment and when bored (eg, games)	Important app characteristics: Entertainment	Features for use when bored/individual time of usage	Accepta
Mobile phone and app usage	Listening to music	—b	Music	Rejectc,d
Test app experiences	Disadvantage: High usage effort through tracking (as a result not everything was tracked)	Important app characteristics: Fast use	Supporting low user effort and fast use	Accepta
Test app experiences	Advantage: Test-app use for comparison of visual feedback with others	Favorite apps are mostly communications apps	Social comparison	Accepta
Test app experiences	Improvement suggestion: More feedback through additional evaluation charts	—	Different evaluation charts	Rejectc,e

^aMaintain suspense and adherence.

^bNot applicable.

^cNot relevant for target behavior/not in line with target behavior.

^dNot affordable as incentive.

^eFocus shall be kept on portions not on calorie intake.