Teaching of specific groups & persons with special educational needs 4 Inclusive education / mainstreaming 3 Primary & middle schools 3 Teacher training 3 History of education 2 Literacy strategies 2 Calculations 1 Content-based recommendation 1 Cosine similarity 1 Education computing 1 Environmental science, engineering and technology 1 Face-to-face learning 1 Level of educations 1 Recommendation techniques 1 Recommender systems 1 Students 1 Teaching of students with emotional & behavioural difficulties 1 Technology: general issues 1 Text processing 1 Text-based documents 1 Universities 1 User's preferences 1 Vector space models 1 Vector spaces 1