Another approach...
My objection isn't to providing structured handwriting practice or information for kids. My objection is when developmentally inappropriate expectations are put on kids - that would be expecting really mature letter formation or expecting that kids will do hours of handwriting a day. I also don't like the approach of requiring good handwriting across the curriculum because it can take something a kid loves - like math - and turn it into drudgery.
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So, what worked well for us was to treat handwriting as a stand alone activity beginning with the use of Handwriting Without Tears. So, when the child was handwriting he could focus totally on handwriting. We found ways to minimize handwriting at other times if he wished - typing, dictating to parents, avoiding worksheets, etc. This worked really well because the regular practice lead to handwriting getting easier and easier and along the way we avoided frustration with tying other subjects to handwriting.
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If you plan to have your child go to school in the near future I don't think it is unreasonable to offer some handwriting instruction, but I would recognize that he may actually improve his handwriting more from short, steady practice than from requiring him to have good handwriting all the time. By short and steady - I mean really short - like five or ten minutes a day, but very consistent so the child develops muscle memory.