Characterization of wave propagation parameters for Green River Oil Shale is essentially complete, although much work is needed to define the fracture mechanisms adequately. Several fracture models have been developed and await large-scale verification; these models predict interesting and potentially useful effects arising from anisotropy. The results of material parameter variation and explosive type, boostering, and geometrical emplacement given represent a first step in optimization of the large-scale explosive event designed to create a modified in situ retort. Plans for the LASL/Colony Mine experiments also are presented; these tests are crucial to development of a computer-based, predictive rock mechanics capability.