The CLF is a social movement; an equalizer for all school systems including children from government schools, private schools and madaris to address challenges of learning, reviving a culture of reading and generating content for textbooks and supplementary materials in the classrooms.
The hand is a non-SI unit of measurement of length standardized to 4 inches (101.6 mm).
It is a common unit of measurement now used only for quantifying the height of the horse. Tracing a tradition backward is a dicey proposition. We know that today a hand is 4 inches, with one inch increments, and the measurement is from level ground to the highest non-variable skeletal structure on the horse, the withers.