Iterative Development of an Innovative Smartphone-Based Dietary Assessment Tool: Traqq

To collect dietary intake data in a fast and reliable manner, flexible innovative smartphone application (app) called Traqq was developed (iOS/Android). This app can be used as food record 24-h recall (or shorter periods). Different sampling schemes created on either prespecified or random days/times within predetermined period for both methods, with push notifications to urge the participants register their intake. In case of non-response, are automatically rescheduled ensure complete collection. For use record, respondents access log throughout day. Food records close at end day; recalls after submission consumed items. The well module provide an extensive list based Dutch composition database (FCDB), which accustomed fit different research purposes. When selecting item, simultaneously prompted insert portion size, i.e., household measures (e.g., cups, spoons, glasses), standard sizes small, medium, large), weight grams, eating occasion/time consumption. Portion size options adjusted, e.g., only entry grams weighed time consumption instead occasion). also includes My Dishes function, allows respondent create own recipes product combinations daily breakfast) report total quantity consumed. Subsequently, accounts yield retention factors. stored secure server. If desired, additional questions, general those related specific items occasions incorporated. paper describes development system (app backend), including expert evaluations usability testing.