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| Tracking id | Article title | Study type | Research method | Year | QA1 | QA2 | QA3 | QA4 | Total |
|
| LT 1 | Design patterns to enhance accessibility and use of social applications for older adults [41] | Journal | Heuristic evaluation technique | 2015 | 1 | 1 | 1 | 1 | 4 |
| LT 2 | Multi-layered interfaces to improve older adults' initial learnability of mobile applications [9] | Journal | Experimental | 2010 | 1 | 1 | 0.5 | 1 | 3.5 |
| LT 3 | How older adults learn to use mobile devices: Survey and field investigation [5] | Journal | Survey and field investigation | 2012 | 1 | 0.5 | 0.5 | 1 | 3 |
| LT 4 | Process of design and usability evaluation of a telepsychology web and virtual reality system for the elderly: Butler [20] | Journal | Survey | 2013 | 1 | 1 | 0 | 1 | 3 |
| LT 5 | Older adults' attitudes and barriers toward the use of mobile phones [22] | Journal | Descriptive study/questionnaire | 2016 | 1 | 1 | 1 | 0.5 | 3.5 |
| LT 6 | Mobile apps for older users–The development of mobile app repository for older people [7] | Conference | Review the usability issue | 2014 | 1 | 1 | 0 | 0.5 | 2.5 |
| LT 7 | Understanding the process of learning touch screen mobile applications [42] | Conference | Survey questionnaire | 2013 | 1 | 0 | 0 | 1 | 2 |
| LT 8 | Age-related differences in the initial usability of mobile device icons [43] | Journal | Qualitative exploratory study | 2009 | 1 | 1 | 0.5 | 1 | 3.5 |
| LT 9 | On some aspects of improving mobile applications for the elderly [44] | Conference | Experimental study | 2007 | 1 | 0.5 | 0.5 | 1 | 3 |
| LT 10 | Adaptive training interfaces for less-experienced, elderly users of electronic devices [45] | Journal | Experimental study | 2013 | 1 | 1 | 0.5 | 1 | 3.5 |
| LT 11 | Investigating the usability of PDAs with aging users [46] | Conference | Pilot study/interviews and questionnaires | 2013 | 1 | 0 | 0 | 0.5 | 1.5 |
| LT 12 | Elderly text-entry performance on touchscreens [47] | Conference | Empirical study | 2012 | 1 | 1 | 1 | 0.5 | 3.5 |
| LT 13 | A study of the use of mobile phones by older persons [16] | Conference | A mixed method of qualitative and quantitative approaches | 2006 | 1 | 1 | 0.5 | 1 | 3.5 |
| LT 14 | Acceptance of mobile technology by older adults: A preliminary study [48] | Conference | Empirical study | 2016 | 1 | 1 | 0.5 | 1 | 3.5 |
| LT 15 | Accessibility to mobile interfaces for older people [49] | Conference | Survey | 2014 | 1 | 1 | 1 | 1 | 4 |
| LT 16 | Age-related difference in the use of mobile phones [50] | Conference | Survey and questionnaire | 2014 | 1 | 1 | 1 | 1 | 4 |
| LT 17 | Factors affecting the adoption and use of mobile devices and services by elderly people – results from a pilot study [51] | Conference | Empirical study/interview | 2006 | 1 | 1 | 1 | 0.5 | 3.5 |
| LT 18 | The use of mobile phones by older adults: A malaysian study [8] | Conference | Questionnaire/survey | 2008 | 1 | 1 | 1 | 0.5 | 3.5 |
| LT 19 | How older adults meet complexity: Aging effects on the usability of different mobile phones [52] | Journal | Experiment | 2005 | 1 | 0.5 | 0.5 | 1 | 3 |
| LT 20 | Usability problems experienced by elderly users in-home healthcare systems [53] | Journal | Empirically-based usability evaluation studies | 2014 | 1 | 1 | 0.5 | 0.5 | 3 |
| LT 21 | Older adults' use of smartphones: An investigation of the factors influencing the acceptance of new functions [54] | Journal | Questionnaire/survey | 2013 | 1 | 1 | 1 | 1 | 4 |
| LT 22 | Use and design of handheld computers for older adults: A review and appraisal [55] | Journal | Empirical study | 2012 | 1 | 1 | 1 | 1 | 4 |
| LT 23 | Design for elderly-friendly: Mobile phone application and design that suitable for elderly [56] | Journal | Experimental | 2014 | 1 | 0 | 0 | 1 | 2 |
| LT 24 | Older people and mobile phones: A multi-method investigation [15] | Journal | Qualitative and quantitative method | 2008 | 1 | 1 | 1 | 1 | 4 |
| LT 25 | Recommendations for the development of web interfaces on tablets/iPods with emphasis on elderly users [57] | Conference | Qualitative and exploratory | 2015 | 1 | 1 | 1 | 1 | 4 |
| LT 26 | User interfaces with a touch of grey?–Towards a specific UI design for people in the transition age [58] | Conference | Qualitative empirical study | 2015 | 1 | 0.5 | 0.5 | 1 | 3 |
| LT 27 | Senior-friendly icon design for the mobile phone [59] | Conference | Survey | 2008 | 1 | 1 | 1 | 0.5 | 3.5 |
| LT 28 | A qualitative study to identify icons characteristics on mobile phones applications interfaces [18] | Conference | Qualitative exploratory study | 2013 | 1 | 0.5 | 0.5 | 1 | 3 |
| LT 29 | A study of smartphone usage and barriers among the elderly [60] | Conference | Qualitative/semistructured interview | 2014 | 1 | 1 | 1 | 1 | 4 |
| LT 30 | Older people and their use of mobile devices: Issues purposes and context [61] | Conference | Qualitative/focus group | 2013 | 1 | 0.5 | 0 | 0.5 | 2 |
| LT 31 | Users' perspective of smartphone platforms usability: An empirical study [10] | Conference | Empirical study/questionnaire | 2014 | 1 | 1 | 1 | 0.5 | 3.5 |
| LT 32 | Usability challenges in mobile application [27] | Journal | LR | 2013 | 1 | 1 | 1 | 1 | 4 |
| LT 33 | Which factors form older adults' acceptance of mobile information and communication technologies? [62] | Conference | Experimental study | 2015 | 1 | 1 | 1 | 1 | 4 |
| LT 34 | Determining the effect of menu element size on the usability of mobile applications [63] | Conference | Experimental study/questionnaire | 2015 | 1 | 0.5 | 1 | 1 | 3.5 |
| LT 35 | The interaction experiences of visually impaired people with assistive technology: A case study of smartphones [64] | Journal | Empirical study | 2016 | 1 | 0.5 | 0.5 | 1 | 3.5 |
| LT 36 | Smart but not adapted enough: Heuristic evaluation of smartphone launchers with an adapted interface and assistive technologies for older adults [65] | Journal | Exploratory/empirical study | 2018 | 1 | 1 | 0.5 | 1 | 3.5 |
| LT 37 | Design and evaluation of a mobile user interface for older adults: Navigation, interaction, and visual design recommendations [66] | Conference | Empirical study | 2014 | 1 | 1 | 1 | 1 | 4 |
| LT 38 | Older people, assistive technologies, and the barriers to adoption: A systematic review [67] | Journal | SLR | 2016 | 1 | 1 | 1 | 1 | 4 |
| LT 39 | Investigating the problems faced by older adults and people with disabilities in online environments [68] | Journal | Evaluation of website | 2007 | 1 | 0 | 0 | 1 | 2 |
| LT 40 | Empirical studies on the usability of mHealth apps: A systematic literature review [2] | Journal | SLR | 2015 | 1 | 1 | 0.5 | 1 | 3.5 |
| LT 41 | Technology use by older adults and barriers to using technology [21] | Conference | Survey | 2014 | 1 | 1 | 1 | 0.5 | 3.5 |
| LT 42 | Older people, mobile device and navigation [69] | Journal | Case study | 2004 | 1 | 0.5 | 0.5 | 0.5 | 2.5 |
| LT 43 | Design principles to accommodate older adults [70] | Journal | Empirical | 2012 | 1 | 1 | 1 | 1 | 4 |
| LT 44 | Personal and other factors affecting the acceptance of smartphone technology by older Chinese adults [71] | Journal | Structured questionnaire/interview | 2016 | 1 | 1 | 1 | 1 | 4 |
| LT 45 | Factor influencing the use of smartphones by malaysian elderly | Journal | Interview and survey | 2014 | 1 | 1 | 1 | 1 | 4 |
| LT 46 | Improving the accessibility of tactile interaction for older users: Lowering accuracy requirements to support drag-and-drop [72] | Conference | Empirical study | 2015 | 1 | 1 | 1 | 1 | 4 |
| LT 47 | Early user involvement in the development of information technology-related products for older people [73] | Conference | Questionnaire/focus group/interview | 2004 | 1 | 1 | 0 | 1 | 3 |
| LT 48 | Perspective: Older adults' adoption of technology: An integrated approach to identifying determinants and barriers [12] | Conference | Survey study | 2015 | 1 | 1 | 0.5 | 0.5 | 3 |
| LT 49 | Usability evaluation of the smartphone user interface in supporting elderly users from the experts' perspective [74] | Journal | Heuristic evaluation | 2018 | 1 | 1 | 0.5 | 1 | 3.5 |
| LT50 | Development of a framework to improve the use of mobile devices by the elderly [75] | Conference | Survey | 2018 | 1 | 1 | 1 | 0.5 | 3.5 |
| LT 51 | Aging barriers influencing mobile health usability for older adults: A literature-based framework (MOLD-US) [76] | Journal | Literature review | 2018 | 0.5 | 1 | 0 | 1 | 2.5 |
| LT 52 | Mobile health for older adult patients: Using an aging barriers framework to classify usability problems [30] | Journal | Case study | 2019 | 1 | 1 | 0.5 | 1 | 3.5 |
| LT 53 | Older adults' use of the mobile device: Usability challenges while navigating various interfaces [6] | Journal | Empirical study/interviews | 2019 | 1 | 1 | 1 | 1 | 4 |
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