Its a common question that comes up, and as far as my wife and I could figure out it has never actually been an issue here. One of the things people don't recognize right away is that rarely are you the only person home schooling, there can be lots of people in your area doing the same. One of the programs we did was for science a bunch of us did a one science topic for the week, and everyone in the group's kids would go to that parent's house for some particular expertise or investigation. These were 5, 7 even 10 student groups of similar ages working on the same material. Similarly for Reikes which was 15 - 25 home schooled kids once a week meeting up at a county park to discuss the ecology, bio-diversity, flora, fauna, land management, lots of stuff.

If the impression is home schooling is 1 kid sitting at home all day doing the same things they would do in a class room, you are not seeing what is going on around here. Groups of kids tackling problems and learning about history, math, communication, societies and communities, and all the material you'd normally get in school, just in chunkier bits with the opportunity to go deeper into the topic if you're interested and just pick up the required bits if you're not. Lots of reading, lots of field trips (the Sierras are fabulous for doing geology field trips), museums and such. Oh and lots and lots of reading.

I'd love to see some more rigorous work on this.