Prediction is of great importance for the reasoning on the feasibility of completion the selection process. In this study, we compared the expected effectiveness of two intrapopulation selection methods of S₁ progeny and half-sib progeny via Design I mating scheme in improving the yield of Nubaria yellow maize population (NYP). For fairer comparison, we unified germplasm used in the two methods by using S₁ seeds supposed to be kept for recombination in half-sib family selection as a germplasm of S₁ family selection. This permitted studying the outbred and inbred progeny for the same parent.  Our germplasm involved 81 S₁ families, and 324 full-sib families forming 81 half-sib families. Evaluation were done at Gemmeiza and Sids locations representing two different environments of Middle Delta and Upper Egypt regions, respectively. By looking over the performance of couples of families for parents, there was no clear relation between performance of inbred and outbred families. Design I analysis showed predominance of additive genetic variance component in all studied traits in both environments, whereas dominance variance had negative values in most cases. Influence of environment was obvious on changing genetic variance from location to another. Heritability values were high for both progenies for most studied traits at both locations. Genetic gains were conflicting among different studied traits. The preference was for S₁ family selection for yield components (ear diameter, ear length and kernels number/ear), except rows number/ ear where the advantage was for half-sib family selection adding to plant height, ear height and ear position traits. Both methods were almost equal for 50 % silking and still S₁ family selection has the bigger expected gain for grain yield trait.