The way spelling is done in HOD is a stepping stone for CM style dictation.
I know we probably all grew up doing spelling lists, with pretests and posttests, but the way the plans are written in the HOD guide is different. It applies the idea of the mind being like a camera taking a "picture" of the word each time it sees it.
So, for HOD spelling - Day 1 always has the child look at one word written in black on an index card. Study it, and when child says he is ready, take the card away and child writes just that one word on his marker board. If he misses it, right away, erase it and show him the card again (to erase that incorrect "picture" in his mind immediately), and when he says he is ready, take the card away until he writes it correctly. Then, Day 2's spelling has you just saying the word, using it in a sentence. The child tries to write the word from memory, but if he misses it, erase it immediately to erase the incorrect "picture" and show him the index card, allowing him to study it as he did on Day 1 and then write it. On Day 3, you only pick 3 words the child needs to practice the most. One word at a time, the child should use the word in a sentence orally, as you write the sentence on markerboard for him. Then, the child looks at the markerboard to copy the sentence on paper. You help the child correct any mistakes then. Finally, on Day 4, you say the word, use it in a sentence, and child tries to write it correctly. This time, if it is missed, erase it, and show the child the index card again. Have him fix it on his paper, and while looking at the index card, do the activity to review missed words (it rotates each week). The review activities include some of the ideas mentioned in this thread - great minds think alike, right?!?
Some of them are to jump in place and spell the word out loud jumping each time they say a letter (great for a bodily kinesthetic child or verbal child), write the missed word and have students trace it 3 times using 3 different colors (great for the artistic child), trace the word in dry oatmeal - cornmeal - or sand on a plate (another great one for bodily kinesthetic dc), write the word with sidewalk chalk or fingerpaint, etc.
There are several great posts written by Carrie about spelling. The first one addresses spelling retention and why not to pretest. The second one further explains why HOD does spelling lists before doing dictation.
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HTH!
In Christ,
Julie