The development of this special form of museums in the USA is traced, to make it comprehensible, from which theoretical concepts this type of museums evolved.The processes of development of children?s museums provides an insight to the different offers.The difference between children?s museums and traditional ones is that children?s museum are not category based museums, but concentrate on a target audience. Most traditional museums are based on a democratic understanding of how to run a museum, meaning that they will have special guided tours and workshops for a lot of different audiences. Children?s museums concentrate on their target audience?s needs while the concept is still in the making.Since children?s museums don?t have a longterm topic in their exhibition concepts, and since the topics change on a regular basis, they don?t have a collection. They rather deal with the question of which object they need, to cover a special topic.The third chapter deals with the theoretical concepts, exhibition designers refer to. The history of museumpedagogic shows, how the value and content of what was called museumpedagogic changed. The subchapters ?Event or Content?? and ?Childhood in the Age of Media? reveal an insight into the necessity and benefit of such institutions.Children?s museums ?speak? in a different ?language? than traditional museums. Interactive ?Hans On? exhibits, installations, media and a so called ?prepared environment? talk to the visitors and envite them to decode the topic of the exhibition. The assignment also deals with ?word and action? and scenographic means of arrangements inside a museum.Three children?s museums of Austria are described in a fourth chapter - deeper insight into the work and the thoughts of those involved in exhibitionmaking is given by the curators and museumspadagogues.