“… Hybrid Methods: Combined both above methods. [29], [30], [16], [31] , [32], [33], [34], [20] Model-based methods [35], [36], [37], [12], [22], [18], [17], [38], [39], [15] , [20], [21] Hybrid Methods [40], [36], [19], [41], [42], [43], [44] In collaborative RS in education, model-based method is the most prefered as shiwn in Table II. Among the methods used are Tag-based [40], clustering [18], [22], data mining [17], [12], [39], [28] iterative method [45], Learner"s Role based Multi-Dimensional [21], and 2-Tuple fuzzy linguistic approach [15], [20] [38].…”