## 3 Results
### RQ4: For What Purposes Have Been Applied the Proposed Technology Solution?  
Figure 4 shows the classification of the target skills in the primary studies, and 16 main categories were identified, including social communication, behavior, learning, social reciprocity, facial expressions and emotion, attention, navigation, literacy, language skill, social skills practice, pretend play, motor skill, job interview, daily prayers, brush teeth and bakery. The majority of research conducted was related to improving social communication skills (31%), followed by behavior (11.1%) and learning (11.1%), while the remaining skills are used in two or one study each. There are four studies in which authors have used two or more skills [63,72,80,81]. The studies related to social communication and behavior were briefly described below.  
A series of research has been conducted on the smart glasses systems Brain Power Autism System (Empowered Brain system), which uses AR and emotional artificial intelligence to assist the social communication of autistic children and adults. [PERSON] et al. [51] evaluated the tolerance and usability of the Empowered Brain system with ASD. [PERSON] et al. [52] investigated the safety and negative effect of EBS along with its effectiveness and usability in a classroom environment.  
Figure 3: Distribution of participants’ number in studies.  
[PERSON] et al. [68] have conducted a study to assess the effectiveness of AR training programs named Quicker Vision app to improve social skills with autism. [PERSON] et al. [73] have combined the use of AR with the PECS method (Picture Exchange Communication System) in training the communication ability of children with autism. The prototype developed by the authors called Multimedia AR app uses images, video and sounds that allow an individual to work with PECS by just scanning a QR code instead of selecting an image in traditional PECS. [PERSON] [60] presented a report about an augmented reality coloring book (ARCB) to teach ASD children how to recognize and understand some specific social signals. This is the only study that has been found about augmented reality coloring books. ARCB can keep the participants' attention and maintain the positive intervention results to the maintenance stage. [PERSON] et al. [74] have reported the use of an AR app to improve the communication field in children with autism. The goal is to investigate whether AR intervention will increase the attention process and speech expression.  
[PERSON] et al. [70] have conducted a study to enhance the effectiveness of autistic children's request for help and expression functions. The authors developed the Auto Organizational Menu (AOM), which combined augmented reality (AR) with video of key parts with action (KPV) and evaluated it through the observation method. [PERSON] et al. [72] developed a framework to support children with ASD and ID study in an enhanced education environment to improve social communication and behavior, while the users of the designed system are parents and teachers, which may reduce the engagement of autistic children. Regarding the skill of behavior, [PERSON] et al. [57] have investigated the changes in ADHD-related symptoms in children, adolescents, and young adults with ASD immediately after the use of the Empowered Brain system. The authors used the ABC-H scale to test the participants and grouped them according to their scores. Likewise, [PERSON] et al. [63] presented the behavioral and social-emotional effects of using the Empowered Brain on students with ASD to assess the feasibility and efficacy. They conducted a study to investigate if EBS reduces the irritability and hyperactivity of the users. [PERSON] et al. [55] performed one session intervention in school and reported a lower ABC score in the post-test, which improved nonverbal communication, eye contact and social participation.