A b s t r a c t -Group recommender systems p r o v i d e groups of users with shared r e c o m m e n d a t i o n s . They have great potential for easing group decision processes, while at the same t i m e entailing new technological and user-centred challenges. In this paper we present t h e GroupRecoPF platform providing developers with support for building scalable and userf r i e n d l y g r o u p recommender s y s t e m s . I t leverages on advanced concepts for group recommendation

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... strategy e x p l o r a t i o n , performance optimisation, session persistence and mobility, as well as open interfaces. K e y w o r d s -G r o u p R e c o m m e n d e r Platform; R e c o m m e n d e r A l g o r i t h m s ; D i s t r i b u t i o n ; S c a l a b i l i t y . movies has been well-documented, the experience with the companion recommendation merging strategy is limited. Acceptance evaluations should, therefore, address companion recommendations. Also, extending the programming interfaces for multifarious communication among the platform's systems would be interesting (e.g., facilitating communication among the clients in situations were wide area networks are not available using Bluetooth).