What it is that you have a set of technology fields. These would be Land Advancements, Transportation/Movement, Atomic Weapons, ect. The player choses one, or how many ever, though usually I choose one and begins researching it.
At the beginning at each country’s turn, that country gets one free technology. Player chooses specific development and records die roll on chart
Player unlocks new technology after he cumulatively reaches that nation’s probability (20 if excellent, 25 if good, 30 if fair, 35 if poor)
To gain subsequent advancements, 15 (20 if fair or poor) additional technology points are required for L2 and L3 breakthroughs