Advanced Planning or Supply Chain Planning constitutes a sub-task of Supply Chain Management. It focuses on planning of operational processes, and hence has its primary area of application in manufacturing and distribution of physical products. Advanced Planning Systems (APS) build upon databases of ERP systems. They enhance the latter by a concept of hierarchical planning which makes use of modern methods as developed in Operations Research and related fields. This article gives an overview of solution methods implemented in APS and modelling capabilities.