Wide-angle X-ray diffraction has been used to characterize different grades of conventionally injection moulded and shear-controlled-orientation injection moulded isotactic polypropylene. The occurrence of the gamma-phase in injection mouldings was discussed in particular. A newly defined gamma-phase index is used as a criterion for the characterization of mouldings. The gamma-phase was shown to be associated with pronounced molecular orientation while the beta-phase is indicative of low modulus. Shear-controlled-orientation injection moulding (SCORIM) provided for a good control on the final properties of the mouldings.