We report two new results, from temperature dependent transport measurements in two In 0.53Ga 0.47As/InP heterostructures, concerning the scaling of electronic transport in the integral quantum Hall effect. First, in a sample which has spin resolved Landau levels N=0↓, 1↓, 1↑, we find that the extrema of dρ xy dB , d 2ρ xx dB 2 and d 3ρ xy dB 3 in all spin-split Landau levels diverge like T − α , with a= K, 2 K, 3 K respectively. The exponent, k=0.42 ± 0.04, uniquely describes the localization to delocalization transition. Moreover, by generalizing these results to higher order derivatives of the transport coefficients ρ, we find that Δρ((B)−ρ(B ∗) ) are invariant under a length scale transformation. Second, in a sample with lower mobility the spin splitting for the N=1 Landau level is not resolved for T>60 mK, we find that both dρ xy dB (B ∗) and 1 ΔB in the N=1 Landau level diverge as T − K 2 for 60 mK < T < 2.5 K. On the other hand, both quantities follow T −K for the spin-split N=0↓ Landau level.