Abstract
The paper deals with the shrinkage and warpage phenomenon briefly presenting the most important influence factors and their interaction involved in dimensional changes of injected plastic parts. The predictable tolerances, design strategy and the main required action are debated for one final purpose: maximum and yet realistic accuracy of dimensional precision, in a cheapest, easy manufacturability and easy operating injection tool. Finally, there are presented some useful considerations for minimizing the effect of shrinkage and warpage in dimensional variance of injected plastic parts. Keywords: injection moulding, tolerance, shrinkage, warpage