In our sub-project we are concerned with techniques for the development of reliable information systems on the basis of their formal specification. Our work focuses on the specification language TROLL \em light which allows to describe the part of the world to be modeled as a community of concurrently existing and communicating objects. Our specification language comes along with an integrated, open development environment. The task of this environment is to give support for the creation of correct information systems. Two important ingredients of the environment to be described here in more detail are the animator and the proof support system.