iveness properties, 257 ObjectGeode, 155 log file Tau Simulator, 63 Navigator window loop HMSC operator Tau Validator, 118 Tau Validator, 122 nonregression loop MSC operator ObjectGeode, 93 Tau Validator, 119 Tau Simulator, 62 loose time progression nonsuccess loop ObjectGeode, 105 ObjectGeode, 260 Index observation formalisms, 112 regression testing observation of simulation, ObjectGeode, 93 Tau Simulator, 62 observation, specificities repeat MSC operator Tau Validator, 113 ObjectGeode, 152 observer process, in bit-state simulation repeating a command Tau Validator, 220 ObjectGeode, 98 observer processes Tau Simulator, 65 Tau Validator, 132 rule, in bit-state simulation observer, GOAL Tau Validator, 217 ObjectGeode, 159 rules observer, hierarchical MSC Tau Validator, 114, 117 ObjectGeode, 142 observer, MSC safety properties, 257 ObjectGeode, 139 save simulation commands Tau Validator, 117 Tau Simulator, 48 observer, rule save simulation scenario Tau Validator, 114 ObjectGeode, 78 observer, stop conditions scenario replay ObjectGeode, 136 ObjectGeode, 84 on-the-fly verification, 111 Tau Simulator, 55 or MSC operator scheduling ObjectGeode, 151 ObjectGeode, 282 Tau Simulator, 40 Tau Validator, 40 power walk scheduling like Tau Tau Validator, 256 ObjectGeode, 282 printf scripting Tau Simulator, 267 ObjectGeode, 93 Tau Simulator, 62 random simulation ObjectGeode, 172 Array, 21 Tau Validator, 167 block type, 23 random simulation repetition channel, 13 ObjectGeode, 174 communication, 11 random simulation, MSC-driven create a process instance, 18 ObjectGeode, 178 dash nextstate, 15 random simulation, with observers decision, 19 ObjectGeode, 175 FIFO of a process, 15 random walk informal task, 17 Tau Validator, 169 input, 15 random walk, with MSC instance of process, 10 Tau Validator, 170 literals, 21 reachable states, 182 newtype, 21 ready queue nextstate, 15 Tau Simulator, 65 now, 19 ready queue, rearranging offspring, 11, 18 Tau Simulator, 68 output, 18 ready-first package, 22 ObjectGeode, 282 parent, 11 Tau Simulato