The document describes an approach for conducting modular trade studies using SysML simulation. It discusses implementing trade studies in Cameo Systems Modeler and IBM Rhapsody. The key aspects of the approach are: 1. Creating a generic system block with attribute properties and specialized subsystem blocks that inherit those properties. 2. Instancing the specialized subsystem blocks to evaluate their attribute properties through simulation. 3. Assembling the subsystem instances into vehicle instances to evaluate overall system utility through parametric simulation constraints. This allows evaluating different subsystem options in a modular way and integrating the results into an overall system trade study comparison. The document provides step-by-step explanations of implementing this approach in Cameo and Rhaps