The progress achieved by the corn hybrids' development in Central America is analyzed as the source for the regional data base of the PCCMCA (Programa Colaborativo Centroamericano para el Mejoramiento de Cultivos y Animales), taking as reference the 51 trials conducted between 1988 and 1990. This evaluation was conducted using a methodology which determines the confidence of response (RNi or probability of normalized response above zero) of superior cultivars with respect to a control. The confidence of the cultivars (HB83,HB85, H30, HA46, Dekalb B833, Pio-neer XLH53, HRI7, MAX307, H33 and TACSA203) was determined as a measure which integrates the magnitude of response as we1l as the variability of yields, with respect to the control H5. The evaluated genotypes were divided into three cIasses with respect to the H5. Genotypes of Superior confidence (H30 and HB85, 0.9>= RNi <= 1.0), Good confidence (HB83, HA46, Dekalb B833, XLH53, 0.8 >= RNi < 0.90) and Average confidence (HRI7, MAX307, H33, 0.6 >= RNi < 0.8). The genotypes HB85 and HB83 showed the highest potential as regional controls. In conclusion, further studies are needed to correlate the use of confidence to other methods in order to determine the genotype stability.