To supprort the integration of existing programs into multidisciplinary 
applications, we have constructed the Multidisciplinary Application Runtime 
System (MARS).  MARS supports legacy code integration, heterogeneous 
execution environments, conditional execution, dynamic module invocation and
realignment, and dynamic binding of I/O paths.  It also provides a simple 
specification language to script the overall execution of the multidisciplinary 
application.  In this paper we describe extensions to the MARS system to 
support dynamic expansion of individual modules in a pipelined multidisciplinary
application.  Specifically, we focus on the software infrastructure needed to 
support dynamic module expansion in a pipelined multidisciplinary application.