# A Methodology to Evaluate User Experience for People with Autism Spectrum Disorder
## 3 Related Work  
To complement our findings in a previous systematic literature review [6], we have reviewed the literature that has emerged since the year 2019 in order to update the conclusions previously obtained regarding these related studies. In recent times, the amount of research focused on developing systems and/or products for people with ASD has increased, which is possibly due to the growing interest in the affinity that people with ASD have with technology. For systems and/or products developed for people with ASD to be friendly and usable, research has evaluated the satisfaction and/or perception of experts in the domain (psychologists, differential teachers, speech therapists), tutors and/or people with ASD, through different evaluation methods. Studies have evaluated their proposals through the application of simplified and/or complete versions of the system usability scale (SUS) [8]. Some studies have modified the SUS scale (using simplified language, incorporating emoticons, or reducing the scale) when used with users with ASD [16; 17]. Other studies have evaluated their proposals with experts in ASD and/or tutors of users with ASD, using the SUS scale in its complete [18; 19; 20] or reduced [21] version. Other researchers have evaluated their proposals through sets of heuristics. [PERSON] and [PERSON] [22] state that they have evaluated their proposed application using [PERSON]'s heuristics [23]. [PERSON] et al. [24] mention having evaluated their mobile application with a heuristic evaluation using the Semiotic Interface sign Design and Evaluation (SIDE) framework [25]. Studies mention having evaluated their proposals using questionnaires. [PERSON] et al. [26] have evaluated the usability of their application through \"direct observation\" of users interacting with the application and the execution of the questionnaire proposed by [PERSON] [27] which aims to assess usability based on five categories: (1) ease of use, (2) learnability, (3) feedback and good error messages, (4) adequate help and documentation, and (5) appealing interface. [PERSON] et al. [28] propose to evaluate their proposal through the creation of a new questionnaire model called M-UTUAT, which is based on seven attributes of the People at the Center of Mobile Application Development (PACMAD) model [29] and three factors of the Unified Theory of Acceptance and Use of Technology (UTAUT) model [30]. Multiple investigations have evaluated their proposals based on a set of evaluation methods. [PERSON] et al. [31] mention having evaluated the usability of their proposal with the participation of people with ASD, through the application of three evaluation methods: (1) system usability scale (SUS) [8], (2) VR sensitivity scale and (3) a heuristic evaluation with the [PERSON] set of heuristics [9]. [PERSON] et al. [32] state that they have evaluated their proposal with professionals, parents/caregivers and children with ASD through three evaluation methods: (1) system usability scale (SUS) [8], (2) Acceptability, Likely Effectiveness, Feasibility, and Appropriateness Questionnaire (ALFA-Q) [33] and (3) semi-structured Customer Discovery style interviews. [PERSON] et al. [34] present a process based on four phases, where phase three aims to evaluate the usability of the proposed mobile application through a set of methods. In it, 18 people (9 people without ASD and 9 people with ASD) have been asked to participate in the execution of four evaluation methods sequentially. The evaluation methods used were: (1) Demographic Survey, (2) Think-Aloud Protocol [35], (3) Cognitive Walkthrough [36] and (4) system usability scale [8]. Studies in recent years show interest in evaluating the usability and UX in systems and/or products used by people with ASD.