verbal behavior mapping

[Sweetum]

I was conversing with a mom recently and she said she found vb-mapping really helpful in determining functioning levels of her DS. when we started ABA, I had done an assessment - ABLLS and the assessments in
A Work in Progress: Behavior Management Strategies and a Curriculum for Intensive Behavioral Treatment of Autism

Behavioral Intervention for Young Children With Autism: A Manual for Parents and Professionals

All recommended by Gena here on BBB. thank you for that.
I was wondering if VB-Mapping is different from these and if it helps in honing in on some skills that are missed in the others. I would love to hear more about this. thanks.