AI seminar, September 3rd, 2003: Mats Petter Pettersson, AI@CS.LU Modern Planning Techniques Abstract: Since the mid-90s, there has been a steady imporovement in the performance of planning systems. This development is mainly based on better search control (heuristics and pruning). Based on a talk given by Jörg Hoffmann at the 2003 Summer School on AI Planning, I will present some of the techniques that modern planners use.