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Chapter 4 achieving them \[32\]. In this study, task completion time was used as an indicator of efficiency. Satisfaction is the users’ comfort with and positive attitudes towards the use of a system \[32\]. In this study, participants were interviewed about their satisfaction with the ease of use of the Turkish TTSQ. Ease of use was defined as the degree to which the use of a particular system is free from effort \[33\]. Setting and Participant Selection Recruitment took place in twelve primary care practices in deprived areas of Utrecht, The Netherlands. Potential participants were invited by their physical therapist to participate in this study. Researcher SB was a native Turkish speaker with a Turkish background and employed as a physical therapist in one of the recruiting practices. No other recruiting therapists had Turkish backgrounds or spoke Turkish. Each recruiting therapist shortly explained the goal of the study to potential participants and provided them with Turkish and Dutch versions of a flyer and information letter. The flyer contained a brief summary of the background and goal of the research project and an invitation to its readers to read more about the project in the accompanying information letter. Both versions of the flyer and information letter were written in plain language. If patients were interested in participating, their therapist asked permission to give their contact information to the researchers. If patients spoke and understood Dutch, researcher MW contacted them by telephone; otherwise, researcher SB contacted them. During the telephone conversation, the researchers invited questions, checked that patients understood what was being asked of them, and checked that inclusion criteria were met. Inclusion criteria were: aged 18 years or older, able to understand the Turkish language, and both parents born in Turkey. The sampling procedure was aimed at getting a sample of 6-12 participants, typical for formative usability testing of devices like the TTSQ \[34\] because it would reveal the most important points needing improvement for further development of a tool without the risk of unnecessary expenditures \[35\]. Data collection was stopped when a good balance was reached in terms of age, gender, level of education, level of functional health literacy, and prior experience with using a tablet computer. Throughout the recruitment process, the recruiting physical therapists were constantly kept informed about the profiles 144