In focus of this thesis is the assessment of adoptive parents' suitability and appropriateness, the preceding phase to the procedure of establishing the adoption and in which preparatory actions are taken in order to establish the adoption procedure as successfully as possible. The assessment of adoptive parents' suitability and appropriateness is exceptionally important because the adoption outcome, realization of purpose and protection of a child's best interest who was left without parental care, largely depends on the quality of its implementation. Thesis presents the assessment of adoptive parents' suitability and appropriateness with an insight into the complexity of legal assumptions, as well as the physical, psychological and social assumptions of potential adopters which must be suitable for the characteristics and needs of the specific child that is being adopted. By elaborating on the topic, the steps that need to be taken during the assessment are covered, from the compilation of an expert opinion on suitability and appropriateness for adoption and the professional preparation of potential adopters, until their registration in the register of potential adopters, but also the further procedure of selecting the most suitable adopter and preparing the child for adoption.