This paper reviews work at the Aeronautical Research Institute of Sweden, and addresses major issues of importance in evaluating the effect of impact on composite structures. Some more extensive reviews of work by other researchers are referenced. The paper addresses impact response and damage formation, damage characterization, and residual strength and stability by combination of experiments and analysis. Studies showing that impact response type depends on impactor-plate mass ratio are presented. Small mass impact is generally more critical at a given configuration and energy. Analytical models for small mass impact and for damage initiation and growth during large mass impact are discussed. Rate dependency of matrix-dominated properties is briefly discussed. Geometric and constitutive characterization of impact damage zones is presented and the influence of degraded properties demonstrated. The use of an FE-based plate model to simulate delamination growth due to sublaminate buckling and panel skin buckling in stiffened panels after impact is described. Skin buckling causes a steep increase in delamination strain energy release rate and should be prevented.