(From CM Original Series)
Steps of a Dictation Lesson.––Dictation lessons, conducted in some such way as the following, usually result in good spelling. A child of eight or nine prepares a paragraph, older children a page, or two or
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three pages. The child prepares by himself, by looking at the word he is not sure of, and then seeing it with his eyes shut. Before he begins, the teacher asks what words he thinks will need his attention. He generally knows, but the teacher may point out any word likely to be a cause of stumbling. He lets his teacher know when he is ready. The teacher asks if there are any words he is not sure of. These she puts, one by one, on the blackboard, letting the child look till he has a picture, and then rubbing the word out. If anyone is still doubtful he should be called to put the word he is not sure of on the board, the teacher watching to rub out the word when a wrong letter begins to appear, and again helping the child to get a mental picture. Then the teacher gives out the dictation, clause by clause, each clause repeated once. She dictates with a view to the pointing, which the children are expected to put in as they write; but they must not be told 'comma,' 'semicolon,' etc. After the sort of preparation I have described, which takes ten minutes or less, there is rarely an error in spelling. If there be, it is well worth while for the teacher to be on the watch with slips of stamp-paper to put over the wrong word, that its image may be erased as far as possible. At the end of the lesson, the child should again study the wrong word in his book until he says he is sure of, and should write it correctly on the stamp-paper.
A lesson of this kind secures the hearty co-operation of children, who feel they take their due part in it; and it also prepares them for the second condition of good spelling, which is––much reading combined with the habit of imaging the words as they are read.
Illiterate spelling is usually a sign of sparse read-
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ing; but, sometimes, of hasty reading without the habit of seeing the words that are skimmed over.
Spelling must not be lost sight of in the children's other studies, though they should not be teased to spell. It is well to write a difficult proper name, for example, on the blackboard in the course of history or geography readings, rubbing the word out when the children say they can see it. The whole secret of spelling lies in the habit of visualising words from memory, and children must be trained to visualise in the course of their reading. They enjoy this way of learning to spell.
From amblesideonline: (posted here for my own ease of reference)
Dictation, which reinforces spelling, is when the child writes something as the parent dictates. This is not for testing purposes - the child should be familiar with the passage or sentence being written. You can let them "study" for it first so that he knows how to spell the words. He might close his eyes and try to picture the passage accurately. He might practice words he's unsure about spelling. Only when he feels he is ready does the dictation exercise begin. This makes it more likely that the child will spell words correctly the first time. Some children are natural spellers and seem to effortlessly absorb spelling from their copywork and reading. For other children, dictation can help polish spelling skills because the child will have to memorize how to spell the word before the dictation exercise begins. The parent then reads the passage slowly and clearly while the child writes it from memory. Some parents use dictation as a way to test their child's spelling, using misspelled words as a spelling list. But caution should be used because once a child sees or writes a word incorrectly, that incorrect spelling is recorded in his memory. (Sand, rice, cornmeal, salt or shaving cream, which allows misspelled words to be wiped out immediately, is a fun way to practice writing for young children.)
A child does not start dictation until he has mastered handwriting from copywork experience. His first dictation exercise may be a single sentence. By 10 or 11 years of age, he might be able to do a few sentences. Older children might do a paragraph or two once a week.
By 10 to 12 years of age, some children, especially those who don't learn visually or are dyslexic, will still be having trouble spelling and need extra help. Programs that Ambleside members have used with success are Mary Pecci's Super Speller and DesignAStudy's Natural Speller. Sequential Spelling or the book "Seeing Stars" by Nanci Bell may be helpful for dyslexics. Spelling Workout, although popular and effective with some list members, does not follow CM's philosophy. Spelling Power is also used with success by some list members, but none of the Advisory members have seen it to assess its compatibilty with Charlotte Mason's methods.