In this paper an empiric validation of a Person to Role Allocation Process is presented. In this process the allocation of persons to fulfill roles is made according to the capacities that the persons possess and those required by the roles in the software process. A set of experiments are carried out dealing with the development of the Initiation, Planning and Estimation Process, Domain Study Process, Requirements Analysis Process and Design Process of eight projects. It was proved that the estimated time deviation, as well as the errors found in the technical reviews of requirements specification, were less when the persons fulfilling the roles of planning engineer, domain analyst, requirements specificator and designer were allocated, according to the proposed process, considering the set of critical human capacities.