TABLE 5.

Cluster terms.

Clusters	Terms
1 (10 terms)	Artificial intelligence; education; online learning; blended learning; deep learning; augmented reality; expert systems; intelligent systems; ontologies; artificial intelligence
2 (10 terms)	System; adaptive e-learning; data mining; emotions; environment; fuzzy logic; intelligent tutoring system; learning styles; personality; technology
3 (9 terms)	Educational data mining; social networks; systems; computer programming; educational games; learning analytics; management; online; tutoring systems
4 (9 terms)	Model; students; knowledge; behavior; engagement; genetic algorithm; intelligent tutoring systems; optimization; particle swarm optimization
5 (7 terms)	e-Learning; design; 2nd life; instruction; pedagogy; SLOODLE; teaching model
6 (7 terms)	Swarm intelligence; ant colony optimization algorithm; ant colony system; collaborative learning; learners’ behavior; learning objects; learning paths
7 (4 terms)	Performance; achievement; analytics; big data