Method for evaluating a biometric identification function, the evaluation method being implemented by a processing unit, for example a processor, on the basis of a set of candidate biometric data acquired using a biometric sensor and on the basis of a set of reference biometric data (B R), the candidate biometric data (B T) and the reference biometric data (B R) being of the same type and each associated with a known individual, the biometric identification function (f), applied to a candidate biometric datum (B T) and to a reference biometric datum (B R), returning a result for the match between said two data, the method comprising steps of: - obtaining pairs of false matches, each pair comprising a candidate biometric datum (B T) and a reference biometric datum (B R) which are not associated with the same known individual, and the match result of which is above or equal to a predetermined threshold, - determining, for each candidate biometric datum (B T) contained in at least one pair of false matches, a first number which is associated with said candidate biometric datum (B T) and equal to the number of pairs of false matches which are obtained comprising said candidate biometric datum (B T), and/or determining, for each reference biometric datum (B R) contained in at least one pair of false matches, a second number which is associated with said reference biometric datum (B R) and equal to the number of pairs of false matches which are obtained comprising said reference biometric datum (B R), - calculating a bias score associated with the biometric identification function (f), the bias score being calculated as a function of a maximum of the first numbers which are determined on the basis of the pairs of false matches and/or as a function of a maximum of the second numbers which are determined on the basis of the pairs of false matches, - evaluating the bias score with respect to a bias threshold, the biometric identification function (f) being evaluated as sufficiently unbiased if the bias score is below or equal to the bias threshold. the candidate biometric data (B T) and the reference biometric data (B R) being of the same type and each associated with a known individual, the biometric identification function (f), applied to a candidate biometric datum (B T) and to a reference biometric datum (B R), returning a result for the match between said two data, the method comprising steps of: - obtaining pairs of false matches, each pair comprising a candidate biometric datum (B T) and a reference biometric datum (B R) which are not associated with the same known individual, and the match result of which is above or equal to a predetermined threshold, - determining, for each candidate biometric datum (B T) contained in at least one pair of false matches, a first number which is associated with said candidate biometric datum (B T) and equal to the number of pairs of false matches which are obtained comprising said candidate biometric datum (B T), and/or determining, for each reference biometric datum (B R) contained in at least one pair of false matches, a second number which is associated with said reference biometric datum (B R) and equal to the number of pairs of false matches which are obtained comprising said reference biometric datum (B R), - calculating a bias score associated with the biometric identification function (f), the bias score being calculated as a function of a maximum of the first numbers which are determined on the basis of the pairs of false matches and/or as a function of a maximum of the second numbers which are determined on the basis of the pairs of false matches, - evaluating the bias score with respect to a bias threshold, the biometric identification function (f) being evaluated as sufficiently unbiased if the bias score is below or equal to the bias threshold. - obtaining pairs of false matches, each pair comprising a candidate biometric datum (B T) and a reference biometric datum (B R) which are not associated with the same known individual, and the match result of which is above or equal to a predetermined threshold, - determining, for each candidate biometric datum (B T) contained in at least one pair of false matches, a first number which is associated with said candidate biometric datum (B T) and equal to the number of pairs of false matches which are obtained comprising said candidate biometric datum (B T), and/or determining, for each reference biometric datum (B R) contained in at least one pair of false matches, a second number which is associated with said reference biometric datum (B R) and equal to the number of pairs of false matches which are obtained comprising said reference biometric datum (B R), - calculating a bias score associated with the biometric identification function (f), the bias score being calculated as a function of a maximum of the first numbers which are determined on the basis of the pairs of false matches and/or as a function of a maximum of the second numbers which are determined on the basis of the pairs of false matches, - evaluating the bias score with respect to a bias threshold, the biometric identification function (f) being evaluated as sufficiently unbiased if the bias score is below or equal to the bias threshold.