Socio-emotional skills are known as skills related to the regulation of thoughts, emotions and behaviors, concerning how individuals manage their emotions, perceive themselves and relate to others, thus influencing a wide range of personal and social aspects throughout a person s life. The objective of this study was to build a hetero-report scale to assess social-emotional skills in children aged from 6 to 12 years, aimed at fathers, mothers or guardians. As a specific objective, initial evidence of content-based validity was investigated. The questionnaire items were developed based on the categories of operational definitions of feelings and behaviors found in the literature regarding the construct, organized from the taxonomy of the Big five model. The response scale is a seven-point Likert scale (agreement). After its construction, the items were evaluated by three researchers who were familiar with the structure being worked on. The Content Validity Index was used to assess the quality and representativeness of the items and the Kappa index to assess the agreement between experts on the items factors. In addition, a semantic analysis of the items with the target audience (2 parents, 1 mother and 1 grandmother) was performed. The results point to an adequate under-standing of the items, indicating evidence of content validity. Further studies should be conducted to assess the instrument s psychometric properties in order to obtain robust validity evidence.