Technical Challenges of a Mobile Application Supporting Intersession Processes in Psychotherapy

The usage of mobile applications in healthcare is gaining popularity in recent years. The ubiquity of a sophisticated mobile appliance that is applicable to sample ecological patient data in real life by acquiring both mental state and environmental data has enabled new possibilities for researchers and healthcare providers. Collecting data using the mentioned approach is often called Ecological Momentary Assessment (EMA) and is characterized by an unidirectional data flow towards the platform provider. A more challenging approach, in turn, is called Ecological Momentary Intervention (EMI). The latter requires a bidirectional data flow in order to enable the possibility of sending feedback to the patients and controlling their experiences through interventions. Although both approaches are established parts of IT-supported treatments in the field of psychology and psychotherapy until now, the so-called intersession process has not been technically supported appropriately yet. Therefore, the Intersession-Online platform was developed in order to (a) assess intersession processes systematically, (b) monitor a patient, and (c) intervene by suppressing negative thoughts concerning the therapy. In this paper, the technical requirements, architecture, and features of the mobile application of the Intersession-Online platform are presented. In this context, the development of a patient data sampling mechanism, which consists of a sophisticated, inter-questionnaire dependent sampling schedule and synchronization strategy is particularly illustrated and discussed. Altogether, the technical challenges will show that a mobile application supporting intersession processes in psychotherapy is an endeavor which requires many considerations. However, on the other, such a mobile application may be the basis for new technical as well as psychological insights.