. In the case of 1 -> 2 decay process the menu scheme described above is not used because in this simple case the phase space integration is not needed. CompHEP writes on the screen the calculated particle width. If a multi-channel process like Z -> 2*x has been introduced then branchings for all decay modes are displayed (Fig. ). The menu on the screen contains only one function which provides the user with a possibility to calculate the total particle width as a function of one of the model parameters.