# A Methodology to Evaluate User Experience for People with Autism Spectrum Disorder
## 5 A Methodology to Evaluate UX for People with ASD
### S2 Execution Stage
#### 5.2.2 S2.2 Inspections  
Second substage of the execution stage. The inspection substage considers three inspection methods: group-based expert walkthrough, perspective-based inspection, and heuristic evaluation. Next, each evaluation method will be explained in detail. The use of group-based expert walkthrough [40] allows us to identify potential usability problems, possible design improvements and solutions to these problems, through a group inspection carried out in conjunction with professionals \"with practical experience\" in the domain. The evaluation is based on the execution of a set of tasks-scenarios guided by a leader. The evaluation can be carried out using specific criteria of the domain under study, which are familiar to professionals who do not necessarily have knowledge about the UX. Consider that an expert with knowledge in both areas (UX/Usability and in the ASD domain) or a UX/Usability expert should take the lead role in the evaluation. By using a group-based expert walkthrough inspection, we can easily include experts in the domain to the evaluation, as they do not need to have previous experience in executing UX/Usability evaluations. This can result in a greater amount of identified potential problems that are relevant for people with ASD and their characteristics. Table 15 presents a brief specification of the execution of the group-based expert walkthrough method, considering the inputs, execution steps, and outputs (see Appendix A) that are relevant when implementing this evaluation method. Perspective-Based Inspection  
An inspection method that focuses on the identification of specific usability problems through three main perspectives [41]. These perspectives are based on three types of users: novice, expert, and error-handling. Each evaluator assumes the role and point of view of a user and inspects the system, product or service under that user role, guided by a set of inspection questions for each perspective. [PERSON] et al. [41] recommends creating the inspection questions based on an HCI model, for which we recommend considering our nine UX factors [10], and the perspectives, which can include a novice and expert user with ASD. When executing the method, ASD domain experts should support UX/Usability experts if possible. Domain experts may find it easier to put themselves in the shoes of a user with ASD and therefore find specific problems that UX experts may not recognize. Table 16 presents a brief specification of the execution of the perspective-based inspection method, considering the inputs, execution steps, and outputs (see Appendix A) that are relevant when implementing this evaluation method. An inspection method that focuses on finding potential usability problems in systems, products, or services. This method [9] is based on the inspection of evaluators, who look for potential problems based on different sets of previously selected heuristics, while specifying their severity, frequency, and criticality. When using the heuristic evaluation method, the use of tasks and scenarios is optional, and its realization will depend on the investigators. Consider evaluating the system, product, or service through one or more sets of heuristics that consider the characteristics and needs of people with ASD. These are our suggested heuristic sets:  
* [PERSON] and [PERSON] [42] present a set of 15 system-specific heuristics for children with ASD. These 15 heuristics were created through the adaptation and extension of the Nielsen heuristics [43], based on a study of the characteristics of people with ASD. * We are currently developing a set of heuristics to evaluate systems, products, or services for adults with ASD. For the creation of this set of heuristics, we followed the methodology proposed by [PERSON] et al. [44], considering as a basis our proposal of nine UX factors for people with ASD [10].