First, I will let you know that we are unschoolers and dont' "do" kindergarten, even though my oldest is 6.5 and she lets people know that "now I'm a first grader!". Â 4yo was (and is for DD2) playtime, storytime, art and craft time.
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However, not to bore you with our personal philosophy, I have really enjoyed these:
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*"Creative Play for Your Toddler", a Waldorf-based craft and playtime book with lots of sweet, easy projects for toys.
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*"Art Fun!" author forgotten.  This book more than any other art book I have come across really focuses on the technique instead of copying the project, which can be fun but is just as often dull.
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*"Anno's Math Games" etc. teaches math concepts without numbers, and with a bit of a story line.
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*"PuzzleBuzz" offered by Highlights magazine
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For science, some good tools are really all you need, plus a handful of fun experiments, because a 4yo will want to repeat them over and over (like "Dancing Raisins" or making rock candy). Â We bought the girls magnifying glasses and packed backpacks with a stiff-backed sketchbook, colored pencils, measure tapes, etc., small binoculars and we'd go play "scientist" in the forest. Â We'd measure and sketch: whatever inspired them.
   We also keep piles of guidebooks around the house, which the girls pore over.
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I know that Christopherus website offers a Waldorf kindergarten guide (not a curriculum).
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WARNING! Â OPINIONS NEXT! Â Because I can't help myself, but you can skip this part if you want:
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4yo kids need time to develop their imaginations. Â FREE time. Â Activities to support creative play in their free time. Â They need exploration time, to learn and do and study with their hands. Â They need time to interpret these things on their own terms, outside the approved vocabulary offered in texts and curriculums. Â To study a leaf in the context of their whole brain, because that is how kids this young experience things. Â If you start labeling and interpreting things for him, if you teach him the "proper" way to observe, that diminishes his experience instead of enriching it. Â Of course, if he asks, "what's that?", well, that's your opening....
   Kids who adore bookwork and academics are the kids that almost need free time the most.  Parents see their love of this kind of study, recognize it as the same type of study work that older students learn and they think that it is the greatest thing to encourage it early.  They must support it, give them MORE!  Certainly supporting their interests is a great thing, but at this age, playtime should take precedence.
   The first place I would avoid augmenting is screen time.  We do enjoy our TV time, but learning and exploration should ideally be hands-on at his age.  Great that he has fun on the computer, but I wouldn't add more time.
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ALL DONE! Â It sounds like you have a kid that will be "easy" to homeschool, and by that I mean one that is eager in all the ways we want them to be so we don't get mired in the doubt that naturally creeps into our heads!