| ID | RQ1 | RQ2 | RQ3 | RQ4 | RQ5 | RQ6 | Ref | Publication channel | Year | Research type | Study context | Study field | Data collection strategy | ML model | ML tasks | ML techniques |
| 1 | [28] | Conference | 2019 | VS | Academic | e-Learning | Context | SL | Classification | ANN | 2 | [29] | Journal | 2019 | VS | Academic | e-Health | Context, interactions, profile | SL | Classification | ANN | 3 | [30] | Conference | 2019 | SP | Academic | e-Health | Context, interactions, profile | SL | Classification | ANN | 4 | [31] | Conference | 2019 | ES | | Recommendation | Context | UL | Clustering | K-means | 5 | [32] | Conference | 2019 | VS | Academic | e-Learning | Interactions | UL | | ANN | 6 | [33] | Conference | 2019 | ES | Academic | Recommendation | Interactions | RL | | Q-learning. | 7 | [34] | Journal | 2019 | ES | Academic | e-Learning | Context, interactions | SL + UL | Clustering, classification | K-means, SVM | 8 | [35] | Journal | 2019 | SP | Academic | e-Learning | Context, interactions | UL | Association, clustering | AR, K-means | 9 | [36] | Journal | 2019 | ES | Academic | e-Coaching | Context | SL | Classification | MM | 10 | [37] | Conference | 2019 | SP | Academic | e-Commerce | Context, interactions | SL | Classification | RBC | 11 | [38] | Journal | 2019 | ES | Academic | e-Learning | Context, interactions | SL | Classification | ANN, SVM | 12 | [39] | Conference | 2018 | VS | Government | Generic | Interactions, preferences, profile | RL | — | Q-learning | 13 | [40] | Conference | 2018 | ES | Academic | e-Learning | Interactions | SL | Classification | ANN | 14 | [41] | Conference | 2018 | SP | Government | Entertainment | Interactions, preferences | SL | Classification | RF | 15 | [42] | Journal | 2018 | VS | Organization | e-Health | Context | SL | Classification | RBC | 16 | [43] | Conference | 2018 | ES | Organization | Recommendation | Interactions | SL | Regression | KNN, NBC | 17 | [44] | Journal | 2018 | ES | Industrial | e-Health | Context, profile | SL | Classification | RBC | 18 | [45] | Conference | 2017 | SP | Organization | e-Health | Context | SL | Classification | DT | 19 | [46] | Conference | 2017 | ES | Academic | Gamming | Context | SL | Classification | RBC | 20 | [47] | Conference | 2017 | SP | Academic | e-Coaching | Feedbacks | SL | Classification, regression | DT, LR | 21 | [48] | Conference | 2017 | ES | Academic | fs management | Interactions | | | MCDM | 22 | [49] | Conference | 2017 | SP | Academic | Generic | Context, feedbacks, profile | SL | Regression | SVM | 23 | [50] | Journal | 2017 | PP | Organization | Generic | Context | SL | Classification | | 24 | [51] | Journal | 2017 | ES | Organization | e-Coaching | Context, interactions | SL | Classification, clustering | DT, HAC | 25 | [52] | Journal | 2017 | ES | Organization | e-Coaching | Interactions | | | | 26 | [53] | Conference | 2016 | SP | Organization | Generic | Context, interactions | | | | 27 | [54] | Conference | 2016 | SP | Organization | e-Coaching | Context | SL | Classification | SVM | 28 | [55] | Conference | 2016 | ES | Organization | Recommendation | Context, interactions | SL | Association | AR | 29 | [56] | Symposium | 2016 | SP | Academic | Generic | Context, interactions | SL | Classification, clustering | ANN, K-means | 30 | [57] | Conference | 2016 | SP | Academic | Generic | Interactions | | | | 31 | [58] | Journal | 2016 | ES | Organization | e-Learning | Context, profile | | | | 32 | [59] | Conference | 2015 | ES | Organization | Notification management | Context | SL | Classification | NBC, RF | 33 | [60] | Conference | 2015 | SP | Academic | Gamming | Emotion | | Classification | | 34 | [61] | Conference | 2015 | ES | Academic | Natural language processing | Context, interactions | SL | Regression | LR | 35 | [62] | Conference | 2015 | VS | Academic | Recommendation | Context | SL | Classification | SVM | 36 | [63] | Journal | 2015 | ES | Academic | Gamming | Interactions | SL | Clustering | K-means | 37 | [64] | Journal | 2015 | ES | Academic | e-Learning | Context | SL | Classification | RBC | 38 | [65] | Journal | 2014 | ES | Government | Entertainment | Context, preferences | SL | Classification | Tp, CBFM | 39 | [66] | Journal | 2014 | VS | Academic | e-Health | Context | SL | Classification | RBC | 40 | [67] | Conference | 2014 | PP | Academic | Data visualization | Context | | | | 41 | [68] | Conference | 2014 | ES | Organization | Entertainment | Context, interactions | SL | Classification | DT, KNN | 42 | [69] | Journal | 2014 | ES | Organization | e-Health | Context | SL | Classification | RBC | 43 | [70] | Journal | 2014 | PP | Government | Generic | Context | SL | Classification | RBC | 44 | [71] | Workshop | 2014 | ES | Academic | e-Commerce | Preferences, feedbacks | AL | Regression | UR | 45 | [72] | Conference | 2013 | VS | Academic | Generic | Context, interactions | SL | Classification | RBC | 46 | [73] | Conference | 2013 | ES | Academic | Generic | Interactions | SL | Clustering | K-means | 47 | [74] | Conference | 2013 | SP | Academic | e-Learning | Context, interactions | SL | Association | AR | 48 | [75] | Conference | 2013 | VS | Government | Gamming | Interactions | SL | Classification | ANN | 49 | [76] | Journal | 2013 | ES | Government | Generic | Preferences | SL | Classification | KNN | 50 | [77] | Journal | 2013 | ES | Academic | e-Health | Context | SL | Classification | RBC | 51 | [78] | Conference | 2012 | ES | Government | e-Health | Context | SL | Regression | FBA | 52 | [79] | Journal | 2012 | SP | Academic | e-Learning | Profile, interactions | SL | Classification | ANN, FL | 53 | [80] | Conference | 2012 | SP | Government | e-Learning | Context, preferences, profile | SL | Classification | DT | 54 | [81] | Conference | 2012 | VS | Academic | e-Learning | Preferences, profile | SL | Clustering | K-means | 55 | [82] | Journal | 2012 | VS | Organization | Smart home | Feedback, interactions | RL | | Q-learning | 56 | [83] | Journal | 2012 | SP | Organization | e-Travel | Context, preferences | SL | Classification | SVM | 57 | [84] | Journal | 2011 | VS | Academic | Recommendation | Context, interactions | SL | Classification | NBC | 58 | [85] | Conference | 2011 | VS | Academic | Gamming | Interactions | SL | Classification | CN | 59 | [86] | Conference | 2011 | VS | Academic | e-Learning | Context, profile | SL | Classification | ANN, FL | 60 | [87] | Conference | 2011 | ES | Academic | e-Learning | Profile | | | | 61 | [88] | Journal | 2011 | ES | Government | e-Learning | Preferences | SL + UL | Clustering, classification | DT | 62 | [89] | Conference | 2010 | ES | Academic | e-Travel | Context, interactions | UL | Clustering | FBA | 63 | [90] | Conference | 2010 | SP | Academic | | Profile | SL + UL | Clustering, classification | ANN, K-means | 64 | [91] | Conference | 2010 | SP | Government | e-Health | Context | SL | Classification | ANN, FL | 65 | [92] | Journal | 2009 | ES | Government | e-Learning | Context, interactions, profile | SL | Classification, regression | RBC, MM | 66 | [93] | Conference | 2009 | ES | Academic | Generic | Context | SL | Classification | NBC | 67 | [94] | Journal | 2009 | PP | Academic | e-Learning | Context, profile | SL | Classification | | 68 | [95] | Journal | 2009 | VS | Government | Generic | Interactions | UL | Clustering | FBA | 69 | [96] | Conference | 2008 | VS | Organization | E-commerce | Interactions | SL | Association | FBA | 70 | [97] | Journal | 2008 | VS | Industrial | Generic | Interactions | SL | Regression | SPA | 71 | [98] | Conference | 2007 | VS | Academic | Recommendation | Profile | SL | Classification | NBC, FL, MM |
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