Table 2.

Set of prevalent parameters used for learner modeling in content recommender systems

Parameters	Citation
Learning style/Learner Preferences	Dwivedi and Bharadwaj (2015), Senthilnayaki et al. (2015), Imran et al. (2016), Dorca et al. (2016), Bourkoukou and El Bachari (2016), Bourkoukou et al.(2016), Tarus et al.(2017), Labib et al. (2017), Ouf et al. (2017), Araújo et al., (2017), Nafea et al. (2018), Christudas et al.(2018), Wan and Niu (2018), Dwivedi et al. (2018), Klašnja-Milićević et al. (2018b), Aeiad and Meziane (2019), Kolekar et al. (2019), Joy et al. (2019), Segal et al. (2019), Sarwar et al. (2019), Bhaskaran and Santhi (2019), Perumal et al. (2019), Nafea et al. (2019), Kouis et al. (2020), Al Abri et al. (2020), Nihad et al. (2020)
Knowledge level	Dwivedi and Bharadwaj (2015), Imran et al. (2016), Benhamdi et al. (2017), Nafea et al. (2018), Christudas et al. (2018), Dwivedi et al. (2018), and Joy et al. (2019)
Learning path/patterns	Bourkoukou et al. (2017), Tarus et al., (2018a, 2018b), Klašnja-Milićević et al. (2018a), Klašnja-Milićević et al. (2018b), Wan and Niu (2019), and Zhu et al. (2018)
Performance/ Score	Imran et al. (2016), Nabizadeh et al. (2020), Rahman and Abdullah (2018), and Jagadeesan and Subbiah (2020)
Learner Ratings	Dwivedi and Bharadwaj (2015), Tarus et al. (2017), and Deng et al. (2018)
Portal Hit Similarity	Perumal et al. (2019),
Social Tags	Klašnja-Milićević et al. (2018a)
Social Trust	Deng et al. (2018)
Learning need/goal	Anuradha et al. (2020), Ibrahim et al. (2020), Wan and Niu (2016), Shi et al. (2020), and Zhu et al. (2018)
Cognitive/Emotional States	Vanitha and Krishnan (2019) and Hwang et al.(2020a),