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Chalice is a verification tool for object-based concurrent programs. It supports verification of functional properties of the programs as well as providing a deadlock prevention mechanism. It is built on Implicit Dynamic Frames, fractional permissions and permission transfer. Implicit Dynamic Frames have been formulated and proven sound using verification conditions and axiomatisation of the heap and stack. Verification in Chalice is specified in terms of weakest preconditions and havocing thedoi:10.1145/2076674.2076676 dblp:conf/ecoop/RaadD11 fatcat:txdl3jkmyfghtma7j6td7mj5yi