Q: What's the difference between an "upgrade" and an "improvement?" Q: The Training Grounds' form of currency is IP, and yet all the rates are listed in "upgrades." What's the deal? A: The upgrade rates mean two things. For one, if you buy an Improvement that costs a certain number of Upgrades, the IP rate for that Improvement is based on that number of upgrades. If you have, for example, an Improvement costing three upgrades with the upgrade rate being 1 IP, then that Improvement is going to cost 3 IP. Secondly, buying an Improvement that costs a certain number of upgrades adds that number of upgrades to the tech to which it applies. If you buy an Improvement costing 3 upgrades on a technique that has 2 upgrades on it already, that technique now has 5 upgrades on it. The number of upgrade