Research shows that two of the greatest factors in reading and educational success are positive home influence and parental involvement. All ages interacting together - more like the real world. Family focused learning. Teaches family values and religion. Able to match each child's circadian rhythms.
Parents get to know their own child's learning styles.
Children are allowed to mature at their own speed. Self pacing - each child learns at their own speed. Avoids school burn-out which often occurs by 4th or 5th grade. Maintains and stimulates child's desire to learn and explore. Lots of responsibility on parent's shoulders.