Table 6.

Criteria for inclusion and exclusion of the articles.

Inclusion Criteria	Exclusion Criteria
Studies are written in English only	Studies for which the full text is not available
Studies have been published from 2015 to 2020	Duplicate studies
Studies type is Journal articles and conference papers.	Studies that do not directly aim to help people with autism spectrum disorder only (without other disabilities).
All methodology except (Review, Survey)	Studies involving VR and MR in studies related to augmented reality with ASD.
Studies that provide answers to the main research question or the sub-research questions	Studies that include all types of game-based learning and do not specialize in serious game.
	Studies not related to the applications of PECS