In this paper we present an approach that permits to study the behavior of the nematic phase's order parameter exponent () for all temperatures of the phase; our method makes an independent calculation of for each temperature value T. Here use hypothetical data to analyze the consistence of the results, the limitation of the experimental data usability and the influences of the experimental errors on the (T) curves. After that, we use experimental data to show that the order parameter critical-like exponent presents a constant behavior along the entire domain of the nematic phase.