Abstract:2.1 Introduction and basic requirements2.2 Sources of variability and defects in composite mouldings2.3 Impact of residual stresses and geometrical distortions on performance2.4 Impact of voidage and delaminations on inplane and out-of-plane properties2.5 Impact of misaligned, wavy and wrinkled reinforcements on in-plane and out-of-plane properties2.6 Approaches to minimize the impact of manufacturing defects2.7 Future trends