ABSTRACT
Basically, the randomized complete block design is a group of completely randomized designs (usually, however, each CRD has only one experimental unit per treatment combination). Ordinarily each member of the group contains a sufficient number of homogeneous experimental units to accommodate a complete set of treatment combinations. This collection of experimental units is referred to as a block. One major reason for blocking is that the experimenter does not have a sufficient number of homogeneous experimental units available to run a completely randomized design with several observations per treatment combination.
