The manual is the companion document for the microcomputer program ESPVI 4.0, Electrostatic Precipitation V-I and Performance Model (PB92-502251). The program was developed to provide a user-friendly interface to an advanced model of electrostatic precipitation (ESP) performance. The program is capable of modeling standard ESP configurations as well as those that might be proposed for improved performance. It incorporates many of the latest developments in prediction of ESP performance, including electrical waveform effects, non-rapping reentrainment, and electrode misalignment. The manual provides the documentation needed to load the program from its disk, sets up the computer configuration for optimal operation, and introduces the operation of the program. The user is expected to be familiar with the operation of an ESP and know the important factors that affect it. An example ESP is provided with the program to help with the manual's exposition: it provides a direct comparison of the model's predictions. The program consists of a series of menu screens; the document is similarly organized, with increasing levels of detail provided as the menus become more specific. Finally, a section on the underlying algorithms discusses typical values that might be encountered with the model.