en عمومى General پژوهشي Research paper We study relations between evidence theory and S-approximation spaces. Both theories have their roots in the analysis of Dempster's multivalued mappings and lower and upper probabilities, and have close relations to rough sets. We show that an S-approximation space, satisfying a monotonicity condition, can induce a natural belief structure which is a fundamental block in evidence theory. We also demonstrate that one can induce a natural belief structure on one set, given a belief structure on another set, if the two sets are related by a partial monotone S-approximation space.  Evidence theory, S-approximation spaces, Rough sets, Partial monotonicity, Qualities of approximation. 117 128 http://ijmsi.ir/browse.php?a_code=A-10-2883-1&slc_lang=en&sid=1 A. Shakiba ali.shakiba@vru.ac.ir 10031947532846007452 10031947532846007452 Yes Vali-e-Asr University of Rafsanjan A. Kafshdar Goharshady goharshady@ist.ac.at 10031947532846007453 10031947532846007453 No Institute of Science and Technology Austria (IST Austria) M. R. Hooshmandasl hooshmandasl@yazd.ac.ir 10031947532846007454 10031947532846007454 No University of Mohaghegh Ardabili M. Alambardar Meybodi m.alambardar@sci.ui.ac.ir 10031947532846007455 10031947532846007455 No University of Isfahan