180 1996 Krister Ahlander krister@tdb.uu.se An Object-oriented Approach to Construct PDE Solvers Abstract An object-oriented analysis and design is presented, for a framework in which PDE solvers (programs that numerically solves partial differential equations) may be composed from existing components. The motivation for this work is that object-oriented technology is more robust to changes than traditional techniques are. The PDE solving system has been implemented in a one-dimensional pilot implementation, which shows that the framework is expressive, flexible and extendible. Through an interface to an object-oriented database on top of the classes, it is shown that PDE solvers can be constructed and changed interactively.