By assessing a combination of geotechnical parameters, it is possible to delineate and classify different strata in the subsurface. Classification may be based on borehole data used to validate the cone penetration test, or on automated routines that have been developed through the analysis of numerous validated results of cone penetration testing.

For more information about electrical cone penetration tests and their interpretation:

Douglas, B.J. & Olson R.S. (1981) Soil classification using electrical cone penetrometer, in: Norris, G.M. & Holtz, R.D. (eds.), Cone-penetration testing and experience. Proceedings ASCE Convention, St. Louis, Missouri, USA. American Society of Civil Engineers, New York, NY, 479 pp.
Robertson, P.K. & Campanella, R.G. (1983) Interpretation of cone-penetration tests. Part 1: Sand; Part 2: Clay. Canadian Geotechnical Journal, vol. 20, pp. 718-745.
Lunne, T., Robertson, P.K ., & Powell, J.J.M. (1997) Cone-penetration testing in geotechnical practice, Blackie Academic and Professional, London, UK, 352 pp.