 Purpose The aim of this study is to investigate the contribution of preoperative urodynamics to mid-urethral slings MUS success for developing an algorithm that uses conventional and easily accessible tools Methods Women with stress urinary incontinence and who desired surgical correction of their incontinence were included in the study. The selection of the procedure was according to an algorithm used in an institution developed by a chief of urogynecology department who had 25 years of urogynecology experience. Urodynamic and baseline factors that may be associated with surgery failure were analyzed in MUS failure. 