Due to the high thermal related stresses during injection molding, the morphological properties and thus also the application properties of the components (optics, mechanics) are considerably influenced. To describe the relationship between process-structure properties, systematic and accurate investigations of the crystallization behavior are required. This research forms part of the DPI program, project #816. Isotactic Polypropylene (iPP) was injection molded with different mold and melt temperatures. The resulting samples were investigated in terms of their semi-crystalline structure using polarized-light optical microscopy (POM), differential scanning calorimetry (DSC) and X-Rays. Different morphologies were observed in POM images depending on the distance of the skin to the core. These structural differences could be verified by DSC and X-ray analysis. Furthermore, the thermal development within the part during the injection molding process was investigated using process simulation. The results contribute to the description of the relationship between the crystallization kinetics of the material and the process parameters that influence the injection-molding induced morphology. This is required to realize process control in injection molding in order to produce pre-defined morphologies.