An application of structual modeling and automated reasoning as an intelligent software development environment for concurrent programs is presented. This application, using an integration of software reuse and theorem-proving methods, synthesizes an absolutely correct program and increases software productivity. The concurrent programs are described by a Prolog-based concurrent object-oriented language called MENDEL/87. The functional part of the reusable component is generated by structural modeling, and the synchronization part is synthesized from temporal-logic specifications by the use of an automated-reasoning mechanism. A description is also given of the MENDELS ZONE, implemented on a Prolog machine, which is the working base of the method.