In this chapter, we talked about the basics of business finance. We mentioned a bunch of finance jargon that is useful to know. We explained why we need a plan. We also walked through the four steps of creating and executing a capacity plan. Finally, we talked about how engineering and finance decisions can affect each other and cause ripples throughout the company.

This is all important to SRE, because a lack of capacity causes service downtime. By working with your coworkers, you can improve your long-term reliability by having a plan to deal with future outages. Remember to first define what your current capacity is, see how it's changing over time, and then get access to the budget to make sure you can handle the predicted growth.

In the next chapter, we will be talking about building tools to improve reliability!