Data entry grids in ISM are organized based on the following continuous survey methods: CIS (Close Interval Survey), AC CIS (AC Close Interval Survey), DCVG (DC Voltage Gradient), ACVG (AC Voltage Gradient), ACCA (AC Current Attenuation), Soil Resistivity, and Pearson. For a description of these survey methods, see Appendix B. Glossary.Important: Survey readings must be assigned to a survey folder in Survey Folder Maintenance before working with data in ISM. If needed, refer to Adding a Continuous Survey Folder for more information.