Modern economics has placed lifelong learning (LLL) at the center of an intensive ongoing political debate. Evidenced-based interventions are needed, not only in continuing education courses for teachers, but also in schools. This paper introduces evaluation results of TALK, a teacher education program for professional teachers with the objective of fostering LLL in schools. Two main goals were investigated: effects on teacher competences and cooperation. 40 secondary-school teachers participated. Repeated measures in a control group design established the gains of TALK: It must be evaluated as a program which is successful in the robust enhancement of teacher competences and cooperation. (Contains 5 tables and 3 figures.)