It asks questions about a site's geology and then suggests possible geophysical methods to study the site. 2 to 10 entry level - some college with computer experience. Have a defined goal, limit the size of the study area, do a pilot study first. Don t create new data unless you have to, search for existing data. Document your data and methods.
Organization is incredibly important.
Seek expertise when needed, don t go it alone. Think about and quantify error in the analysis. Use the simplest available technology and the KISS method in analysis. Don t oversell the possibilities of GIS to your boss. Do first then sell.