Electronic Journal of Differential Equations, Vol. 2002(2002), No. 73, pp. 1-21. Title: A coupled Cahn-Hilliard particle system Author: Tony Shardlow (Durham University, UK) Abstract: A Cahn-Hilliard equation is coupled to a system of stochastic differential equations to model a random growth process. We show the model is well posed and analyze the model asymptotically (in the limit of the interfacial distance becoming small), to recover a free boundary problem. A numerical method together with example solutions is presented. Submitted April 5, 2002. Published August 13, 2002. Math Subject Classifications: 35K35, 65M60, 60H15. Key Words: Boundary Value Problems; Finite Element Methods; Stochastic Partial Differential Equations.