Modeling dynamic fracture and fragmentation has many applications ranging from space debris impact to armor penetration. Modeling scales range from microscopic descriptions at the grain level, to mesomechanical models that average the microprocesses over many grains, to standard continuum models, and up to engineering models at the structural scale. Designers and interpreters of experiments prefer to work at the highest scale possible to minimize computational time, but the higher scale models often have weak links to the underlying physics. This paper discusses current activity to tie the various scale models together by computationally simulating selected experiments at various scales and comparing the “knob settings,” thereby linking the higher scale models to the lower scale ones. Examples are given from the community working on shrapnel hazards in large laser and pulsed power facilities and from the community working on earthquake propagation in the earth’s crust.