OK try this:
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assign a value for each technology
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spend 5 IPC roll one die, roll of 5-6 means no advancement to be made.
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results of 1-4= value marked down from total
example: we assign mechanized infantry at 12 IPC.
Germany spends 5 IPC for researcher, rolls once gets 3, now the score is 9 to obtain mech infantry
next turn the same researcher ( using the OOB rules) rolls again and rolls a 4, now Germany needs 5 more points
next turn they roll 6, nothing happens
next turn they roll a 2, need 3
next turn they roll 4, so they get the tech on that turn.
thats it.
you don’t need this small medium large thing, their is no need to categorize them like this anyway.
The numbers mean nothing and need to be based solely on balance, so i would forget this 5,10,15 crap and just find the accurate number that makes it seem equal to its value. Their is no way that they can be grouped into this format anyway because they are all different rules and have different effects, but at some point a number value can be assigned… discover that and you got a good house rule.
Now you can also assign some “advance points” for some powers as part of a bid, or a +1 or whatever based on total IPC.
I would suspect that if your economy is 40+ you have a better grasp of getting tech, than say a nation getting 10+ IPC a turn, based om the infrastructure.
You might even do something based on VC or total IPC can yield a +1 to die results, or even +2
another idea is for each researcher you got more than 1, you get a +1 on the results ( a 2 becomes a 3 if you got two researchers)
The results:
now technology has more determined characteristics, and it would get realized too quickly because the results are 1-4 and not 1-6.