In recent years many controversial verdicts and studies have brought discussions about the quality of expert opinions in family law into the focus of the media, political and expert public spheres. With the coalition contract, the ruling parties agreed on improving the quality of expert opinions, especially in the sector of family law, in collaboration with professional institutions. Representatives of the legal, psychological and medical associations, the Federal Bar Association and the Federal Chamber of Psychotherapists worked out guidelines for expert opinions in family law in cooperation with the Federal Ministry of Justice and Consumer Protection. The three main quality assurance aspects are scientifically founded procedures, transparency and traceability. These requirements are concretely illustrated in this article with recommendations concerning the procedure and composition of expert opinions.