Really the only timeline that intercepts 1st thru 3rd and 4th edition is 1989.
The project has to rush thru the 1987 updates to make the 1989 deadline in both new and old editions that BEM saw.
In 3rd that is the hard date so PB and everything that is required for TMP must be in place and doing it's intended purpose by November.
For the 4th edition we have the 2017 date.
So whatever is done for the PB update you have 1 date in time that needs to be set in stone and everything evolves around that date, November 1989.
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