TPSys [Garrido, Onaindía, BarberGarrido et al.2001,Garrido, Fox, LongGarrido et al.2002] is a temporal planner based on Graphplan. There are technical differences between TPSys and TGP [Smith WeldSmith Weld1999], but the central use of a temporal plan graph is similar, using the graph to represent the passage of time, with actions having associated durations. As with other Graphplan-based approaches, the search machinery appears to scale badly.