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Objective: A score to identify local wound infections was developed by a panel of experts from seven European countries. The Therapeutic Index for Local Infections (TILI) score was designed for health professionals who are not specialised in wound care. This study was carried out to test the validity of the TILI score in everyday practice., Method: Content validity was analysed by means of evaluation by a panel of experts, individually and face-to-face, followed by a European multicentred, retrospective, observational study. Participating clinicians sent anonymised copies of completed TILI scores for patients with leg ulcers along with a photograph of the wound for analysis by two blinded reviewers. Concordance (Kappa index) and convergent criterion validity (sensitivity, specificity, accuracy, Youden's J Index and receiver operator characteristic (ROC) or area under the curve (AUC) curve) were calculated to construct validity and reliability., Results: A total of 307 patients with leg ulcers from seven institutions in five European countries were included in this retrospective analysis. It was shown that the diagnosis of local wound infection could be documented well with five of the six clinical criteria included in the TILI score. By summing up these facultative criteria in comparison with any direct criteria that may be present, there would have been an indication for local antiseptic wound therapy in 22% of patients examined., Conclusions: The results show that the TILI score is concordant with the expert assessment of patients and with good diagnostic characteristics. Thus, the easy-to-use TILI score can now be used in the daily routine practice of health professionals to diagnose local wound infections.