Important criteria for classifying soil at the family & sub order levels is

Important criteria for classifying soil at the family and suborder levels is the Soil temperature regime.
Soil taxonomy is a hierarchical soil classification system with six categories or levels, theses are order, suborder, great group, subgroup, family and series.
Soil taxonomy is a morphogenetic soil classification system using diagnostic horizons and features to infer pathways of soil genesis and formation.