What proof do you have that it is working? How would you suggest parents reassure themselves that this path is providing everything their children need?
Well starting at the end, there is no path that will provide everything for a child. There are some [paths] that don't even begin to intend to provide everything their children need. Maybe first parents should consider what it is they think their children really need.
As to proof of whether unschooling is working, if the question is whether kids are learning, parents can tell when they're learning because they're there with them. How did you know when your child could ride a bike? You were able to let go, quit running, and watch him ride away. You know they can tell time when they tell you what time it is. You know they're learning to read when you spell something out to your husband and the kid speaks the secret word right in front of the younger siblings. In real-life practical ways children begin to use what they're learning, and as they're not off at school, the parents see the evidence of their learning constantly.
photo of a kaleidoscope (and Holly) by Holly
Holly was six when the response above was written,
and nineteen years old when she took the photo.