Close examination of the LASSI [1,5](16e,15o) wave functions of Fe 3 led to the identification of another large category of deadwood model states, which are systematically removed in the more approximate LASSI[r,q CT ] hierarchy of methods. Using this latter model, we report for the first time practical LASSI calculations on a trimetallic species with both 3d and 4d orbitals in the model space, a calculation which is impossible for conventional CASCI but which gives qualitatively similar results to the corresponding (16e,30o) DMRG-CI calculation. Additionally, LASSI allows us to understand the wave function and draw meaningful conclusions, which is difficult with DMRGCI.