Spanish Adaptation and Validation of the Child Adjustment and Parent Efficacy Scale

(1) Background: The aim of this study is to obtain an instrument, with robust psychometric properties validated with a Spanish sample, that allows for the evaluation of the emotional and behavioural adjustment of children, as well as the perceived ability of parents to manage their children’s problems. (2) Methods: Data from 2618 Spanish parents of 2–12-year-old children were used to evaluate the psychometric properties of the Child Adjustment and Parent Efficacy Scale. In order to develop the intensity scale, exploratory and confirmatory analyses were carried out, and the reliability, validity, and invariance of the measurement model were estimated. (3) Results: A structure of 25 items grouped into two factors are shown, which allows for the evaluation of emotional and behavioural problems and children’s competencies. The model adjustment indicators were satisfactory. Favourable evidence was obtained for the reliability of the measurement model from two perspectives, internal consistency and composite reliability. The discriminant validity was satisfactory, as was the homogeneity of the measurement model based on child gender. Regarding the self-efficacy scale, confirmatory analysis procedures were also carried out, verifying a good factorial structure. (4) Conclusions: Results support a scale with robust psychometric properties that measure child adjustment and parent self-efficacy. The instrument can help to improve family effectiveness and be useful for schools and teachers to promote the well-being of children. The instrument could also be good to evaluate in special contexts, like custody evaluations in a legal or forensic context.