The aim of this study is to develop a valid and reliable measurement tool to measure the deliberative skills of teacher candidates. The research was carried out with 548 teacher candidates studying in different departments and grade levels at two separate state universities. The KMO value of the Exploratory Factor Analysis of the measurement tool was obtained as .94 and the Bartlett Sphericity chi-square value deemed appropriate was X2=9656.340; p<.01. The final measurement tool was statistically structured as 26 items and four (4) factors. Again, certain fit indices of Confirmatory Factor Analysis (CFA) showed that the KMO structure of the tool was applicable. It was understood that the Cronbach Alpha value of the measurement tool was .92 and the total explained variance was 62.94%. In addition, because the lower and upper group means of all items of the final measurement tool were significant and provided internal consistency, it was concluded that the scale items were significantly (p<.01) discriminatory. Thus, the “Teacher Candidate Deliberative Skills Scale” is a valid and reliable tool that can be used to determine the deliberative approach skills of teacher candidates as a scale developed in a 26-item, four-factor, five-point Likert type.