Insoo Kim Berg founded Solution-Focused Brief Therapy (SFBT) with her partner Steve de Shazer in the late 1970s. SFBT focuses on clients' strengths and resources rather than problems, believes clients have the ability to resolve their own concerns, and aims to identify solutions through asking questions instead of providing advice. It has been utilized in various social services fields and is based on the principles that small changes can lead to big differences, the future is negotiable, and the solution is not always directly related to the defined problem.