First, thinking about swapping Increased Production and Aerial Photography.
Second, here’s a write up of the tech rules.
Research and Development
(The Research and Development Phase takes precedes the Purchase and Repair Units Phase)
In this phase, you may attempt to develop improved military technology. To do so, you buy dice that give you a chance for a scientific breakthrough.
Research & Development Sequence
1. Buy research dice
2. Redeem researcher tokens
3. Roll research dice
4. Roll breakthrough dice
5. Mark developments
Step 1: Buy Research Dice
Each die costs 3 IPCs. Buy as many as you wish, including none.
Step 2: Redeem Researcher Tokens
Discard your researcher tokens, claiming one research die for each researcher token.
Step 3: Roll Research Dice
Roll your research dice and assess the results.
Failure: If you roll a “1” or “2,” your research has failed.
Progress: If you roll a “3” or “4,” your research has progressed, but no breakthroughs have been made. Take one researcher token for each “3” or “4” you roll. Researcher tokens entitle you to roll free research dice on your next turn, one for each researcher token.
Success: If you roll at least one “5” or “6,” you have successfully made a technological breakthrough.
Step 4. Roll Breakthrough Dice
If you rolled a “5” or “6” on any research die, choose one of the two breakthrough charts and roll all your successful research dice to see which technological advance you get. You can only receive one advance each turn. Once the breakthrough dice are rolled, choose one of the breakthroughs on the chart whose number matches one of the dice you rolled.
For example, you had 2 successful research dice. You choose Breakthrough Chart 1 and reroll your successful research dice, resulting in a “1” and a “2.” You may choose between Super Submarines and Chemical Warfare.
If you have already received the same result on a previous turn, reroll until you get a new technological advance. Once you have received all the advances on a chart, you cannot gain any more advances from that chart.
Step 5: Mark Developments
If your research was successful, place one of your national control markers inside the appropriate advancement box on the research & development chart. Your development becomes effective immediately.
Any number of powers may develop the same technology, but powers cannot share their technology.