Abstract. It has been done to identify breast tumors with ultrasound data using the Adaptive Neuro Fuzzy Inference System (ANFIS). For the classification given pairs with Membership Functions Score (MFS) 0 - 0.1 for patient output tumor I cancer is very severe; MFS 0.11 - 0.2, for patient tumor / cancer is severe; MFS 0.21 - 0.4 for patient tumor / cancer is not severe, and MFS 0.4 -1 for healt…