Using a 90% success rate, Bouchacort et al.showed that 41 attempts were required to reach proficiency; however, they also showed that if the success rate increased to 95%, the range of attempts required to reach it varies between 41 and 128 attempts.
Bouchacourt y Castromán, usando una tasa de éxito del 90%, mostraron que eran necesarios 41 intentos para alcanzar la eficiencia, pero que si la tasa de éxito se aumentaba al 95%, el rango de intentos necesarios para alcanzarla variaría entre 41 y 128 intentos.