50 years ago, Kamal & Kenig (K&K) portrayed an amalgamated model for the injection molding (IM) process considering concurrent flow and heat transfer during filling, compression and cooling stages of IM. The simultaneous transport phenomena, in macro (MIM) and micro (µIM) IM, have a significant effect on the structuring and properties of molded products. In the case of fiber and elongated nanoparticles (NPs) containing polymers, the structuring and resulting properties are controlled by the orientation of the polymers and the high aspect ratio micro-fibers and elongated NPs. Modeling of the orientation patterns has been complemented by experimental analysis of MIM and µIM comprising microscopy, mechanical and electrical characteristics. The modeling and experimental results showed that the shear and elongation (Fountain flow) flows with simultaneous cooling triggered the formation of an anisotropic layered structure. In the case of µIM two different flow regimes have been distinguished: the "fountain flow", resulting in a skin/core configuration and "plug flow", attributable to wall slippage. The presentation will cover the structure modeling and experimental properties of short fibers polymer composites and elongated NPs containing polymers in MIM and µIM either alone or together, forming hybrid micro-nano composites that demonstrated the means to control anisotropy.