List of Articles پایگاه دانش Open Access Article Abstract Page Full-Text 1 - A Survey on Employees Performance Appraisal Systems by Using the Fuzzy Tree Model Soleyman Iranzadeh Davood Norouzi Sadegh Babaei Heravi Open Access Article Abstract Page Full-Text 2 - Fuzzy tree model for evaluating employee performance evaluation system and Selection evaluation system for branch of University of West Azarbaijan Ebrahim Mollazadeh Ebrahim Ali Mohammadi Asl Ghader Zemestani Open Access Article Abstract Page Full-Text 3 - Presenting a Fuzzy Tree Appraisal Model to Investigate the Systems of the Performance Appraisal of the Employees and to Select the Right Appraisal System for East Azerbaijan Branches of Islamic Azad University Soleyman Iranzadeh Davood Bagheri Asgar Azarkasb