case build process 102 and a simulation process 104 a bias scheme 100 is used to select test instructions and data for test cases a test case build process 102 generates test cases for system tests that are executed in the simulation process 104 which predicts results the test case build process 102 does not benefit from the effectiveness of the previous test cases this exemplary embodiment may be an existing system that can be modified to include test coverage and modified to estimate and improve test case generation fig2 shows an exemplary embodiment of a pseudo random test generation method with test coverage this exemplary embodiment also includes a bias scheme 202 a test case build process 204 and a simulation process 210 which may be the same or similar as those in fig1 or may be improved this exemplary embodiment also includes checklist information 200 input conditions 206 and output conditions 208 the checklist information 200 for the group agents and test coverage data is updated at the beginning and at the end of the simulation process 210 in some exemplary embodiments user input is incorporated in the checklist information 200 in some exemplary embodiments the checklist information 200 stores test coverage data in a three dimensional.