Welcome to the second development diary for Hearts of Iron IV! Today, I am going dive right into the meaty stuff and present one of the larger changes we've made to the game - equipment. It's a broad topic with many implications for how the rest of the game is played, so my goal is to present the general idea without digging into all the details just yet. But don't worry, there will be more details than you can shake a field-marshal's baton at in future diaries!We wanted a more interesting industry model that offered a compelling reason not to always use the latest technology, as well as adding more unit flavor in HoI4. To accomplish this we developed a model where you no longer build full divisions and aircraft wings one at a time; instead, you create production lines to pump out individual vehicles. The longer you run a single production line the more efficient it gets at producing that piece of equipment, and the choice of when to switch over to, say, a newer tank model becomes tricky. Is the war effort best served by a shiny new Tiger that can outclass the competition, or would you rather have 20 Panzer IVs? You will have to make choices like this. Upgrading your equipment now means replacing your old models at the front with new tank designs, for example. The old ones can be put in reserve, sent to less important places, or perhaps given as aid to an ally.This means that a division is basically an assortment of different equipment combined with men who operate them. Most of the stats of a division will come from equipment, so a panzer division without tanks will not be particularly fit for duty. As for exactly what equipment is used by each division, it will depend on how you have structured your divisions. At the smallest level, we are looking at battalion types that make up your divisions determining how much you need of everything, but a division is still the smallest unit that can be moved around the map. For example, adding an extra battalion of artillery to a division means that it will now also require a few more men and a specific number of artillery cannons that you will need to produce before that battalion will be effective. We’ll talk more about this in a later diary.Equipment appears all through the new technology trees. The idea is that unlocking a new piece of equipment should be very visible, and it should be very clear what you will get. Here is a screenshot showing what the armored tech tree looks like for Germany:Armored technology is based around chassis that you unlock. Each of the chassis has 4 subtechs, each of which unlocks a variant. So, for example, once you have unlocked the Panzer III tank you can research the tank destroyer variant, StuG III. The StuG III was a Panzer III chassis with the turret removed and a larger fixed gun placed in its stead. Variants like this can be switched to production lines from the original chassis without much of penalty, so once the Panzer IV becomes your main tank and the Panzer III no longer measures up, it's a perfect time to convert to producing StuGs on those Panzer III lines. Most nations developed their vehicles like this during the war, and we wanted to include this flavor. Historically, the StuG III ended up being the most produced armored vehicle in Germany during the war.There will also be ways to create more custom equipment variants with abilities unlocked by experience over the course of the war. This is also something we will go into more detail on in the future.By switching to equipment from HoI3's more abstracted model, we gain a lot of cool flavor as well as introducing many of the actual interesting choices that leaders of the time had to deal with. We also believe it will make it easier to understand for new players, as well as being more immersive for players. You will now see results like "10 heavy tanks destroyed" rather than some abstracted strength percentage. Because the production models changes over to lines it also doesn't introduce any more unnecessary micro management, so it is really a win-win.That's all from me for today, see you again in a month for another diary!Time to flex your strategic muscles and test your might as your ability to lead your nation will be the ultimate weapon in your arsenal in Hearts of Iron IV.On the battlefields, in the factories, and at the negotiating table. Victory at all costs.Here are a few of the women from the World War II era and how they changed the world: