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This paper intends t o compare t h e performance used t o f i n d t h e e l e c t r i c a l grounding parameters o f a two-layered e a r t h ( r e s i s t i v i t i e s and thickness) evaluated a t p o i n t P o r i n step p. corresponding t o a s p e c i f i c mathematical model. Parameter estimation i s c a r r i e d o u t -i n such a way as t o x -xp get an optimum f i t t i n g between the s e t of r e s i s t i v i t y F(x)

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