It was used by the USCF from 1950 to 1960 and by some other organizations .
The Harkness System was invented by Kenneth Harkness , who published it in 1956 .
Harkness System was used by the USCF from 1950 to 1960 and by some other organizations .
The Harkness System was invented by Kenneth Harkness , who published it in 1956 .