How does Didactiic choose the expert sources used for the activities?

Didactiic finds evidence-based parenting books (pertaining specifically to early childhood development) and translates ideas within each book into original works for Didactiic.  Didactiic scores each expert source on the basis of three criteria: author domain expertise, average Goodreads ratings, and internal Didactiic user score (avg. rating of the activities for each expert source).  

New expert sources will be added on a continual basis.