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To meet the increasing demand for group activities, single-user recommender systems need to be scaled up to provide recommendations to groups of users. This issue is solved by aggregating item preference profiles of individual group members into a single item preference profile, thereby allowing recommendations to be created for this item preference profile. In this paper, we introduce the concept of deep profiles of users, and we propose group recommendation methods based on the aggregation of group members&#x2019; deep profiles, instead of item preference profiles as in previous studies. The term <italic>deep profile</italic> refers to the users&#x2019; profiles that lie deep within the recommendation algorithms. Experiments have shown that group recommendations based on deep profiles give higher efficiency in terms of F1-score and nDCG than those based on item preference profiles.

Profile Aggregation-Based Group Recommender Systems: Moving From Item Preference Profiles to Deep Profiles