The purpose of this study was to develop, test, and validate a questionnaire for assessing social workers’ exposure to client violence, which we call the Client Violence Questionnaire (CVQ). Following established procedures for scale development, four distinct stages of research were conducted, combining qualitative and quantitative methods. The contribution of this study is threefold—methodological, conceptual, and practical. The instrument offers practitioners and academic researchers the opportunity to apply the scale both for internal monitoring and knowledge sharing as well as further research. The development process of the CVQ scale demonstrates how the qualitative method can serve as a distinct research stage and at the same time support and enhance the quantitative one, thus contributing to the validity and applicability of the instrument.