Impact Penetration Dynamics (IPD) is the mechanics of deformation caused by two or more colliding bodies when one of them permanently changes its shape, or its integrity, due to the high forces developed during the impact. In this research, the general impact and penetration event was studied using engineering model approaches. The problem was divided in three separate formulations:​ focus on the projectile, focus on the target, and the complete formulation. To limit the scope of this research, aluminum alloys were selected to study the impact and penetration problems, particularly 6063- T4 aluminum alloy. At the end, different engineering models were formulated:​ first, an engineering model for a deformable projectile impacting a rigid target;​ second, a penetration-engineering model for deformable targets impacted by rigid projectiles;​ and finally, previous models were merged to formulate a general penetration model. The engineering models were compared and verified with results of numerical simulations performed in ANSYS/AUTODYN, and results were validated using experimental data, taken from impact tests. A good consensus was reached among engineering models, computational models and experimental data.