I read the book, looked at the assessment but haven't done it. I have a DYS who is a strong level 4 with some spikey 5s. BUT... and that's a big BUT... he is only a strong level 4 with any milestones that come after age 2.

My DS is a preemie (just by one month but born sickly with an APGAR score of 0 and a 10 day stay in the nursery). His medications made him basically comatose or screaming bloody murder for months. He didn't roll, sit, look at books, watch TV or really anything at all until 7 mo when he came off the medications. It was obvious within a month that he would have been a very attentive baby but he was too ill.

I have an accurate record because we were keeping one for medical issues. If I subtract 6 months to a year off of every milestone to account for his slowed development, he's easily a high Level 4 with more 5s.

$45 will get you halfway to testing with our university's ed.psych program in training... not the best results but better in my own head than any online assessment...