This paper explains chronologically the implementation of thek0-standardization and other parametric methods in Cuba. Fundamental and applied results in the determination of the most important
parameters are obtained, using the IBR-2 at Dubna and Triga Mark III at Mexico reactor facilities. Some modifications in the
Stoughton-Halpering convention, and its comparison with the modified Westcott and Høgdahl method are presented. The application
of the described methods at the CS-ISCTN low flux facility, using the big samples techniques, is presented.