This paper presents the software framework JStatCom which is geared towardsthe development of rich GUI clients for numerical procedures. The concept is tosolve all recurring tasks with the help of reusable Java components. Optionally, onecan delegate the execution of special numerical algorithms to external programs, forexample Gauss or Matlab. This way it is possible to reuse an already existing codebase for numerical routines written in different programming languages and to linkthem with the Java world. A reference application for JStatCom is the econometricsoftware package JMulTi, which will shortly be introduced.