One of the things I do when opening a new chapter is to find all the city expansions and work toward clearing them as quickly as I can. To do this, I hover over the expansion and look at the green line and write it down, then I hover on the tech item the green line pointed to and follow the green line back to the item that opens it. It's a a backwards move, tracking things back to the beginning. each time I write down the tech items I need to complete to get to the city expansion the quickest. when I get back to the scouting tech, I have my list and complete each of those techs and the expansions. then I go back and fill in all the techs to complete the chapter. This has worked wonderfully for me as I get the space I need to have wiggle room with my buildings. I thought everyone knew about this but found that a lot do not so thought I would post it here.