Table 2.
Inclusion and exclusion criteria
| Inclusion criteria | 
|---|
| 
 IC1: Publication date 2017 to 2021 (both years inclusive). IC2: Conference proceedings AND Peer-reviewed journal articles. IC3: In English and accessible. IC4: The study proposes PRS. IC5: The study targets primary school, secondary school, or elementary school students.  | 
| Exclusion criteria | 
| 
 EC1: Gray literature. EC2: Not in the English language. EC3: The study that proposes a recommendation system BUT does not focus on personalization or e-learning. EC4: The subject is personalization BUT in fields other than recommendation systems. EC5: The study that targets populations other than school students, such as teachers, training, disability students, group students, postgraduate or undergraduate students, and researchers. EC6: A duplicated study published in different venues (reporting similar results). EC7: Conference papers that extended to journal papers.  |