Next
the research
menu
appears.
By
right-click with the mouse
on an own industrial city
appears the research
screen.
Here
you will see a picture of the next possible unit from every existing
research categorie with the still missing research months (trurns).
By click
on a category up to four orange research
investment buttons
are visible at the bottom, which stand for a small
to a very good progress chance.
The cost in PP for the research investments in this category are
written on the buttons.
By click on one of this research investment buttons this one will be selected and by click on the O.K. - Button confirmed.

Every nation can start each month (turn) a research in up to two different categories.