The problem of establishing the correlation between, on the one hand, the chemical and phase compositions of Ni1-xWx alloys (0 ≤ x ≤ 0.5) and, on the other hand, the character of the temperature dependences of the electrical resistivity, is considered. Based on the experimental ρ(T) curves, the concentration dependences of are reconstructed in the wide temperature range (50 K ≤ T ≤ 273 K). The ρ(x) curves have features related to a change in the crystal structures of the alloys (concentration fcc-bcc phase transition), their magnetic structures and percolation processes occurring in the two-phase fcc + bcc medium. [ABSTRACT FROM AUTHOR]