## 2 Materials and Methods
### Recruitment  
The therapists were selected and recruited by two clinics that were partners in the project. Physical, occupational, and speech therapists participated in the study. To recruit the freelance therapist in Carinthia, a public announcement was shared on different channels (social media, work groups of therapists). The following inclusion criteria were used to recruit the therapists:  
* Permission to practice as a therapist in the respective country (Austria or Slovenia)
* Access to a PC with internet access, incl. a webcam and microphone
* A current therapeutic relationship with stroke patients The following exclusion criteria were applied:
* Lack of willingness to use digital media (e.g., video telephony).  
The patients in the clinics were recruited by the therapists in coordination with other health professionals from the clinics. In the freelance setting, the therapist and patient were recruited together as a dyad (they were already in an established therapist-patient relationship). Participating patients were selected by the following inclusion criteria:  
* Stroke diagnosis: the patients suffered a stroke and were in the subacute or chronic rehabilitation phase
* Able to use a tablet: the physical and cognitive ability to use a tablet; preparation of the tablet (e.g., placing the tablet on a stand on a table) can be performed by a caregiver or relative  
\begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Country** & **Setting** & **Patients** & **Therapists** & **Duration** \\ \hline Austria & Freelance therapist, Carinthia & 1 patient & Occupational therapist & 10 weeks \\ Austria & Clinical afference, Private Clinic Lafinitzhohe & 2 patients & Occupational, physio, speech therapists & 4 weeks \\ Slovenia & Clinical afference, University rehabilitation & 1 patient & Occupational, physio, speech therapists & 4 weeks \\  & institute Republic of Slovenia & & & \\ \hline \hline \end{tabular}
\end{table}
Table 1: Overview of test sites.  
* Referral from a medical doctor/physician: as the legal basis for the treatment of the patients by the therapists, a referral was needed
* Mobile internet connection at home (at least 3G): An internet connection is necessary for the usage of the platform; the provided tablet was equipped with a SIM card
* The current therapeutic relationship with the therapist: to ensure that the meeting phase between therapist and patient was not a hurdle and could bias the training phase, it was a prerequisite that the patient had already been cared for by the therapists
* Center of life in the private home setting: exclusion of patients living in a long-term care facility, elderly home, etc.  
The following criteria were applied to exclude patients:  
* Limitations in motor function of both arms/hands: at least one hand must have had the ability to control a tablet
* Severe communication impairment: the patient's communication skills had to be available to the extent that feedback on how to use the platform as possible
* Severe hearing impairment: the patients' hearing ability had to be sufficient for them to understand instructions
* Severe visual impairment: adequate visual ability was a prerequisite to use the tablet; slight or medium visual impairments such as short-sightedness were not a reason for exclusion
* Moderate-high dementia: the cognitive abilities of the patient must have been sufficient to understand the therapy instructions and to give feedback in the study
* Lack of compliance in previous therapies: patients who showed a lack of compliance already in therapies prior to the study were excluded