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Since the detailed theoretical study Levy and $Shapiroa$ over a decade ago, incisive new experimental studies have been reported which contradict older measurements of the anisotropy parameters associated with the $I\ast (2P1/2)$ dissociation channels, but disagree among themselves regarding the magnitude of the branching ratio between the $I(2P3/2)$ and $I\ast (2P1/2)channels.b,c$ Previous theoretical studies have also tended to focus on HI, and inconsistently model or overlook apparent discrepancies with the total photodissociation cross-sections for DI. This paper reports our progress on a theoretical re-examination of this system which uses direct least-squares fits to all of the various types of data to attempt to delineate better the underlying potential energy curves and transition moment functions.