In fact, we call it the capability development life cycle. We start by first of all defining what we call the FSE, the future security environment, as to what the world will look like between now and the next 20 years. That gives us the environment within which we're going to be asked to operate. From that environment, we come up with scenarios. Those scenarios are simply events for which the armed forces would be called upon to play a certain role.
A scenario could be what we're involved with in Afghanistan right now. One of the scenarios could be something domestic, something here. It could be something like a podium or the security during the Olympics. We started with 18 of them that were defined there. They were identified. We found that after developing the first eight, we were in fact covering just about all possible areas and events where the armed forces could be called to operate. That's the reason we have eight that are fully defined and fully developed right now, as opposed to 18.
From those scenarios, in order to basically satisfy the government's direction and the level of ambition that it wants, and what it expects from the armed forces, we draw up a capability. In order to do what they're asking us to do, we need a certain capability, whether it's a naval task group that you send overseas, whether it's a full brigade or a contingent of land forces you need, or whether it's a package of CF-18s or a package of transport aircraft that you need to do a specific mission. It defines the capability.
Once you have that capability, then we look at what we have. We look at what we have and also, very importantly, the life expectancy of what we have. We know that at some point in time each one of those will have to be replaced, as we do for the warships and any aircraft we have and for any equipment for the army. Once we have that, it defines when we have to start working on the replacement for those capabilities.
The tool we use is called the strategic capability roadmap and it defines very precisely, by time, when we need to start working to replace the frigates, the CF-18s, and each part of our equipment that we have for our capability. This basically defines it. What we have now on top of that is an investment plan. In fact, the investment plan is the fiscal envelope within which that capability development has to fit. We have no choice. We have to stay within that appropriation. Therefore, we tie in the capability with the fiscal room that we have and we sequence it and phase it so that we maintain the capability while remaining within our fiscal envelope.