A Capacities-Centered Integral Software Process Model (CCISPM)has been designed,covering and modeling all the elevant elements of the software process.In this paper an empi ic validation of one of the processes is presented:the Person to Role Allocation Process.In this process the allocation of persons to fulfill roles is made according to the capacities o behavioral competencies that the persons possess and those requi ed by the roles in the CCISPM.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 model,considering the set of critical capacities.