@barnee
The initial House Rules Expansion play testing for Global 1940 (1st edition - and the later 2nd edition) began the day after the game was released (as soon as we got hands on the G40 game)
At that time, all islands in the Pacific were given an Increased IPC Value.
As play testing commenced it was obvious that not all islands were equally “attractive targets”.
We then studied deeper into the History of those islands to determine their Historical Tactical & Strategic Values.
It seemes that the OOB IPC values mostly indicate a Strategic Value (oil, iron core and other natural resources) rather than a Tactical Value (is the island suited for occupation as part of the fighting and further advance in the Pacific etc.).
Basically, we wanted to add an Increased Tactical Value - which is why the Pacific islands with an Increased IPC Value still have 2 IPC Values (the OOB IPC Value and the Increased IPC Value - this is explained later).
We agreed to gradually change the Increased IPC Values as our play testing went forward - and also agreed that by Play Testing Game No. 50 we should be able to determine the final Increased IPC Value for all islands in the Pacific.
By Play Testing Game No. 36 we also added Increased IPC Values for the islands in the Mediterranian & Atlantic Oceans.
After a few games it was obvious that this was only an advantage for the Axis - so the plan was dropped.
Finally, after Play Testing Game No. 53, we were able to determine the Increased IPC Values in the Pacific - and by that time we also concluded that losses inflicted due to Convoy Disruption should be according to the OOB IPC Values. This is why those islands have 2 IPC values.
The Final Outcome is the one that today is represented in the Axis & Allies Global 1940 House Rules Expansion.