The new US OATP Presidential Directive requiring the largest US funding agencies to mandate OA within 12 months of publication is a wonderful step forward for the entire planet.

Here are some crucial implementational details that will maximize the mandates' effectiveness.

(1) Specify that the deposit of each article must be in an institutional repository (so the universities and research institutions can monitor and ensure compliance as well as adopt mandates of their own).

(2) Specify that the deposit must be done immediately upon publication.

(3) Urge (but do not require) authors to make the immediate-deposit immediately-OA.

(4) Urge (but do not require) authors to reserve the right to make their papers immediately-OA (and other re-use rights) in their contracts with their publishers (as in the Harvard-style mandates).

(5) Shorten, or, better, do not mention allowable OA embargoes at all (so as not to encourage publishers to adopt them).

(6) Implement the repositories' automated "email eprint request" Button (for embargoed [non-OA] deposits).

(7) Designate repository deposit as the sole mechanism for submitting publications for performance review, research assessment, grant application, or grant renewal.

(8) Implement rich usage and citation metrics in the institutional repositories as incentive for compliance.

If this is all done universally, universal OA will soon be upon us -- and a global transition to affordable, sustainable Fair-Gold OA (instead of today's premature, double-paid Fool's-Gold), plus as much CC-BY as users need and authors wish to provide -- will not be far behind.