%0 Conference Paper %A Tschaikowski, Max %A Tribastone, Mirco %B 10th Workshop on Process Algebra and Stochastically Timed Activities (PASTA) %C Ragusa, Italy %D 2011 %F eprints:2558 %P 1-7 %T Refined theory of packages %U http://eprints.imtlucca.it/2558/ %X The fluid approximation for PEPA usually considers large populations of simple interacting sequential components characterised by small local state spaces. A natural question which arises is whether it is possible to extend this technique to composite processes with arbitrary large local state spaces. In [1] the authors were able to give a positive answer for a certain class of models. The current paper will enlarge this class.