Bryan Garner has an article on shall in the current issue of the ABA Journal (go here for the online version).
It doesn’t say anything new, and I don’t need to add anything to what I said in this post from September 2011.
About the author
Ken Adams is the leading authority on how to say clearly whatever you want to say in a contract. He’s author of A Manual of Style for Contract Drafting, and he offers online and in-person training around the world. He’s also head of Adams Contracts, a division of LegalSifter that is developing highly customizable contract templates.