“…However, considering the above characteristics of self-directed learning and the fact that self-reported outcome assessment instruments are frequently used in the teacher education literature, Williamson's self-rating scale of self-directed learning seemed most appropriate to detect the skills required for pre-service preschool teachers [ 15 , 36 , 41 ]. Despite that, we are aware that measurement criteria are not fixed attributes but are dependent on the context and population or the sample being studied, and if the questionnaire has not been validated in the sample of interest, it may be subject to measurement error.…”